SEC Info℠  
    Home      Search      My Interests      Help      Sign In      Please Sign In

Knight Capital Group LLC – ‘10-Q’ for 6/30/11 – ‘XML’

On:  Tuesday, 8/9/11, at 4:02pm ET   ·   For:  6/30/11   ·   Accession #:  1193125-11-216460   ·   File #:  1-14223

Previous ‘10-Q’:  ‘10-Q’ on 5/10/11 for 3/31/11   ·   Next:  ‘10-Q’ on 11/9/11 for 9/30/11   ·   Latest:  ‘10-Q/A’ on 5/10/13 for 3/31/13

Find Words in Filings emoji
 		  in    Show  and   ↓Hints

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 8/09/11  Knight Capital Group LLC          10-Q        6/30/11   89:8.1M                                   Donnelley … Solutions/FA

Quarterly Report   —   Form 10-Q   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML    792K 
 2: EX-31.1     Certification of Chief Executive Officer Pursuant   HTML     33K 
                to Section 302                                                   
 3: EX-31.2     Certification of Chief Financial Officer Pursuant   HTML     33K 
                to Section 302                                                   
 4: EX-32.1     Certification of Chief Executive Officer Pursuant   HTML     28K 
                to Section 906                                                   
 5: EX-32.2     Certification of Chief Financial Officer Pursuant   HTML     28K 
                to Section 906                                                   
18: R1          Document and Entity Information                     HTML     46K 
78: R2          Consolidated Statements of Operations               HTML    133K 
13: R3          Consolidated Statements of Financial Condition      HTML    139K 
14: R4          Consolidated Statements of Financial Condition      HTML     42K 
                (Parenthetical)                                                  
64: R5          Consolidated Statements of Cash Flows               HTML    180K 
37: R6          Organization and Description of the Business        HTML     40K 
71: R7          Significant Accounting Policies                     HTML     83K 
28: R8          Fair Value of Financial Instruments                 HTML    168K 
38: R9          Collateralized Transactions                         HTML     35K 
45: R10         Receivable from and Payable to Brokers, Dealers     HTML     40K 
                and Clearing Organizations                                       
57: R11         Investments                                         HTML     39K 
22: R12         Goodwill and Intangible Assets                      HTML    100K 
35: R13         Long-Term Debt                                      HTML     65K 
30: R14         Comprehensive Income                                HTML     45K 
33: R15         Stock-Based Compensation                            HTML     78K 
72: R16         Income Taxes                                        HTML     46K 
27: R17         Writedown Of Assets And Lease Loss Accrual          HTML     30K 
53: R18         Discontinued Operations                             HTML     58K 
31: R19         Earnings Per Share                                  HTML     58K 
77: R20         Significant Clients                                 HTML     30K 
58: R21         Commitments and Contingent Liabilities              HTML     72K 
65: R22         Financial Instruments with Off-Balance Sheet Risk   HTML     34K 
                and Concentrations of Credit Risk                                
17: R23         Business Segments                                   HTML     64K 
68: R24         Subsequent Event                                    HTML     33K 
26: R25         Significant Accounting Policies (Policy)            HTML    137K 
20: R26         Significant Accounting Policies (Tables)            HTML     46K 
23: R27         Fair Value of Financial Instruments (Tables)        HTML    156K 
47: R28         Receivable from and Payable to Brokers, Dealers     HTML     39K 
                and Clearing Organizations (Tables)                              
63: R29         Investments (Tables)                                HTML     38K 
52: R30         Goodwill and Intangible Assets (Tables)             HTML     98K 
40: R31         Long-Term Debt (Tables)                             HTML     44K 
34: R32         Comprehensive Income (Tables)                       HTML     40K 
50: R33         Stock-Based Compensation (Tables)                   HTML     72K 
76: R34         Income Taxes (Tables)                               HTML     40K 
29: R35         Discontinued Operations (Tables)                    HTML     55K 
79: R36         Earnings Per Share (Tables)                         HTML     55K 
89: R37         Commitments and Contingent Liabilities (Tables)     HTML     60K 
25: R38         Organization and Description of the Business        HTML     30K 
                (Details)                                                        
61: R39         Significant Accounting Policies (Narrative)         HTML     29K 
                (Details)                                                        
39: R40         Significant Accounting Policies (Schedule of        HTML     30K 
                Interest Income and Interest Expense) (Details)                  
51: R41         Significant Accounting Policies (Component of Net   HTML     34K 
                Trading Revenue Includes Dividend Income and                     
                Expense) (Details)                                               
46: R42         Fair Value of Financial Instruments (Narrative)     HTML     32K 
                (Details)                                                        
24: R43         Fair Value of Financial Instruments (Financial      HTML    106K 
                Assets and Liabilities Measured at Fair Value on a               
                Recurring Basis) (Details)                                       
66: R44         Fair Value of Financial Instruments (Fair Value of  HTML     46K 
                Derivative Instruments Effect of Changes in Fair                 
                Value on Statements of Operations) (Details)                     
86: R45         Fair Value of Financial Instruments (Fair Value of  HTML     52K 
                Derivative Instruments Gain (Loss) Recognized)                   
                (Details)                                                        
87: R46         Collateralized Transactions (Details)               HTML     45K 
21: R47         Receivable from and Payable to Brokers, Dealers     HTML     46K 
                and Clearing Organizations (Schedule of Amounts                  
                Receivable from and Payable to Brokers, Dealers                  
                and Clearing Organizations) (Details)                            
19: R48         Investments (Summary of Investments) (Details)      HTML     42K 
83: R49         Goodwill and Intangible Assets (Narrative)          HTML     45K 
                (Details)                                                        
12: R50         Goodwill and Intangible Assets (Goodwill and        HTML     38K 
                Intangible Assets, Net of Accumulated                            
                Amortization) (Details)                                          
43: R51         Goodwill and Intangible Assets (Intangible Assets,  HTML     53K 
                Net of Accumulated Amortization) (Details)                       
36: R52         Goodwill and Intangible Assets (Amortization        HTML     31K 
                Expense) (Details)                                               
16: R53         Goodwill and Intangible Assets (Estimated           HTML     45K 
                Amortization Expense) (Details)                                  
88: R54         Long-Term Debt (Narrative) (Details)                HTML    148K 
73: R55         Long-Term Debt (Summary Of Long-Term Debt)          HTML     38K 
                (Details)                                                        
54: R56         Long-Term Debt (Schedule of Recorded Expenses with  HTML     36K 
                Respect to Notes) (Details)                                      
84: R57         Comprehensive Income (Schedule of Comprehensive     HTML     45K 
                Income) (Details)                                                
41: R58         Stock-Based Compensation (Narrative) (Details)      HTML     45K 
74: R59         Stock-Based Compensation (Employee Compensation     HTML     32K 
                and Benefits, Restricted Awards) (Details)                       
42: R60         Stock-Based Compensation (Summary of Restricted     HTML     58K 
                Awards Activity) (Details)                                       
56: R61         Stock-Based Compensation (Compensation Expense      HTML     33K 
                Relating to Stock Options) (Details)                             
49: R62         Stock-Based Compensation ( Summary of Stock Option  HTML     60K 
                Activity) (Details)                                              
60: R63         Income Taxes (Schedule Of Reconciliation Of         HTML     43K 
                Federal Statutory Income Tax Rate to the Company's               
                Actual Income Tax Rate From Continuing Operations                
                (Details)                                                        
44: R64         Writedown Of Assets And Lease Loss Accrual          HTML     30K 
                (Details)                                                        
59: R65         Discontinued Operations (Schedule of Losses from    HTML     47K 
                Discontinued Operations Net of Tax) (Details)                    
48: R66         Discontinued Operations (Schedule of Discontinued   HTML     44K 
                Operations Assets and Liabilities Recorded in                    
                Other Assets and Accrued Expenses and Other                      
                Liabilities) (Details)                                           
85: R67         Earnings Per Share (Narrative) (Details)            HTML     33K 
70: R68         Earnings Per Share (Schedule of Calculation of      HTML     62K 
                Numerator and Denominator in Earnings Per Share)                 
                (Details)                                                        
75: R69         Significant Clients (Details)                       HTML     31K 
62: R70         Commitments and Contingent Liabilities (Narrative)  HTML     39K 
                (Details)                                                        
15: R71         Commitments and Contingent Liabilities (Schedule    HTML     58K 
                of Lease and Contract Obligations) (Details)                     
69: R72         Commitments and Contingent Liabilities (Fair Value  HTML     30K 
                of Assets or Liability on Future Contract)                       
                (Details)                                                        
32: R73         Commitments and Contingent Liabilities (Schedule    HTML     30K 
                of Realized Gain (Loss) on Future Contracts)                     
                (Details)                                                        
55: R74         Business Segments (Income (Loss) from Continuing    HTML     49K 
                Operations before Income Taxes (Pre-tax Earnings)                
                and Total Assets by Segment) (Details)                           
81: R75         Subsequent Event (Details)                          HTML     35K 
80: XML         IDEA XML File -- Filing Summary                      XML    154K 
82: EXCEL       IDEA Workbook of Financial Reports (.xls)            XLS   1.32M 
 6: EX-101.INS  XBRL Instance -- kcg-20110630                        XML   2.19M 
 8: EX-101.CAL  XBRL Calculations -- kcg-20110630_cal                XML    194K 
 9: EX-101.DEF  XBRL Definitions -- kcg-20110630_def                 XML    400K 
10: EX-101.LAB  XBRL Labels -- kcg-20110630_lab                      XML   1.05M 
11: EX-101.PRE  XBRL Presentations -- kcg-20110630_pre               XML    830K 
 7: EX-101.SCH  XBRL Schema -- kcg-20110630                          XSD    185K 
67: ZIP         XBRL Zipped Folder -- 0001193125-11-216460-xbrl      Zip    165K

‘XML’   —   IDEA XML File — Filing Summary

This Document is an IDEA XML File.

                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Version> 2.3.0.11 </Version>
<ProcessingTime/>
<ReportFormat> Html </ReportFormat>
<ReportType/>
<ContextCount> 292 </ContextCount>
<ElementCount> 324 </ElementCount>
<EntityCount> 1 </EntityCount>
<FootnotesReported> true </FootnotesReported>
<SegmentCount> 73 </SegmentCount>
<ScenarioCount> 0 </ScenarioCount>
<TuplesReported> false </TuplesReported>
<UnitCount> 5 </UnitCount>
<MyReports>
<Report>
<IsDefault> true </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R1.htm </HtmlFileName>
<LongName> 00090 - Document - Document and Entity Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DocumentDocumentAndEntityInformation </Role>
<ShortName> Document and Entity Information </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R2.htm </HtmlFileName>
<LongName> 00100 - Statement - Consolidated Statements of Operations </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/StatementConsolidatedStatementsOfOperations </Role>
<ShortName> Consolidated Statements of Operations </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R3.htm </HtmlFileName>
<LongName> 00200 - Statement - Consolidated Statements of Financial Condition </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/StatementConsolidatedStatementsOfFinancialCondition </Role>
<ShortName> Consolidated Statements of Financial Condition </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R4.htm </HtmlFileName>
<LongName> 00205 - Statement - Consolidated Statements of Financial Condition (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/StatementConsolidatedStatementsOfFinancialConditionParenthetical </Role>
<ShortName> Consolidated Statements of Financial Condition (Parenthetical) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R5.htm </HtmlFileName>
<LongName> 00300 - Statement - Consolidated Statements of Cash Flows </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/StatementConsolidatedStatementsOfCashFlows </Role>
<ShortName> Consolidated Statements of Cash Flows </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R6.htm </HtmlFileName>
<LongName> 10101 - Disclosure - Organization and Description of the Business </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureOrganizationAndDescriptionOfBusiness </Role>
<ShortName> Organization and Description of the Business </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R7.htm </HtmlFileName>
<LongName> 10201 - Disclosure - Significant Accounting Policies </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureSignificantAccountingPolicies </Role>
<ShortName> Significant Accounting Policies </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R8.htm </HtmlFileName>
<LongName> 10301 - Disclosure - Fair Value of Financial Instruments </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureFairValueOfFinancialInstruments </Role>
<ShortName> Fair Value of Financial Instruments </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R9.htm </HtmlFileName>
<LongName> 10401 - Disclosure - Collateralized Transactions </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureCollateralizedTransactions </Role>
<ShortName> Collateralized Transactions </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R10.htm </HtmlFileName>
<LongName> 10501 - Disclosure - Receivable from and Payable to Brokers, Dealers and Clearing Organizations </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureReceivableFromAndPayableToBrokersDealersAndClearingOrganizations </Role>
<ShortName> Receivable from and Payable to Brokers, Dealers and Clearing Organizations </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R11.htm </HtmlFileName>
<LongName> 10601 - Disclosure - Investments </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureInvestments </Role>
<ShortName> Investments </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R12.htm </HtmlFileName>
<LongName> 10701 - Disclosure - Goodwill and Intangible Assets </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssets </Role>
<ShortName> Goodwill and Intangible Assets </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R13.htm </HtmlFileName>
<LongName> 10801 - Disclosure - Long-Term Debt </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureLongTermDebt </Role>
<ShortName> Long-Term Debt </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R14.htm </HtmlFileName>
<LongName> 10901 - Disclosure - Comprehensive Income </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureComprehensiveIncome </Role>
<ShortName> Comprehensive Income </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R15.htm </HtmlFileName>
<LongName> 11001 - Disclosure - Stock-Based Compensation </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureStockBasedCompensation </Role>
<ShortName> Stock-Based Compensation </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R16.htm </HtmlFileName>
<LongName> 11101 - Disclosure - Income Taxes </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureIncomeTaxes </Role>
<ShortName> Income Taxes </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R17.htm </HtmlFileName>
<LongName> 11201 - Disclosure - Writedown Of Assets And Lease Loss Accrual </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureWritedownOfAssetsAndLeaseLossAccrual </Role>
<ShortName> Writedown Of Assets And Lease Loss Accrual </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R18.htm </HtmlFileName>
<LongName> 11301 - Disclosure - Discontinued Operations </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureDiscontinuedOperations </Role>
<ShortName> Discontinued Operations </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R19.htm </HtmlFileName>
<LongName> 11401 - Disclosure - Earnings Per Share </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureEarningsPerShare </Role>
<ShortName> Earnings Per Share </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R20.htm </HtmlFileName>
<LongName> 11501 - Disclosure - Significant Clients </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureSignificantClients </Role>
<ShortName> Significant Clients </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R21.htm </HtmlFileName>
<LongName> 11601 - Disclosure - Commitments and Contingent Liabilities </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureCommitmentsAndContingentLiabilities </Role>
<ShortName> Commitments and Contingent Liabilities </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R22.htm </HtmlFileName>
<LongName> 11701 - Disclosure - Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskAndConcentrationsOfCreditRisk </Role>
<ShortName> Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R23.htm </HtmlFileName>
<LongName> 11801 - Disclosure - Business Segments </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureBusinessSegments </Role>
<ShortName> Business Segments </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R24.htm </HtmlFileName>
<LongName> 11901 - Disclosure - Subsequent Event </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureSubsequentEvent </Role>
<ShortName> Subsequent Event </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R25.htm </HtmlFileName>
<LongName> 20202 - Disclosure - Significant Accounting Policies (Policy) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureSignificantAccountingPoliciesPolicy </Role>
<ShortName> Significant Accounting Policies (Policy) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R26.htm </HtmlFileName>
<LongName> 30203 - Disclosure - Significant Accounting Policies (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureSignificantAccountingPoliciesTables </Role>
<ShortName> Significant Accounting Policies (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R27.htm </HtmlFileName>
<LongName> 30303 - Disclosure - Fair Value of Financial Instruments (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables </Role>
<ShortName> Fair Value of Financial Instruments (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R28.htm </HtmlFileName>
<LongName> 30503 - Disclosure - Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsTables </Role>
<ShortName> Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R29.htm </HtmlFileName>
<LongName> 30603 - Disclosure - Investments (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureInvestmentsTables </Role>
<ShortName> Investments (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R30.htm </HtmlFileName>
<LongName> 30703 - Disclosure - Goodwill and Intangible Assets (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsTables </Role>
<ShortName> Goodwill and Intangible Assets (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R31.htm </HtmlFileName>
<LongName> 30803 - Disclosure - Long-Term Debt (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureLongTermDebtTables </Role>
<ShortName> Long-Term Debt (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R32.htm </HtmlFileName>
<LongName> 30903 - Disclosure - Comprehensive Income (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureComprehensiveIncomeTables </Role>
<ShortName> Comprehensive Income (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R33.htm </HtmlFileName>
<LongName> 31003 - Disclosure - Stock-Based Compensation (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureStockBasedCompensationTables </Role>
<ShortName> Stock-Based Compensation (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R34.htm </HtmlFileName>
<LongName> 31103 - Disclosure - Income Taxes (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureIncomeTaxesTables </Role>
<ShortName> Income Taxes (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R35.htm </HtmlFileName>
<LongName> 31303 - Disclosure - Discontinued Operations (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureDiscontinuedOperationsTables </Role>
<ShortName> Discontinued Operations (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R36.htm </HtmlFileName>
<LongName> 31403 - Disclosure - Earnings Per Share (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureEarningsPerShareTables </Role>
<ShortName> Earnings Per Share (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R37.htm </HtmlFileName>
<LongName> 31603 - Disclosure - Commitments and Contingent Liabilities (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureCommitmentsAndContingentLiabilitiesTables </Role>
<ShortName> Commitments and Contingent Liabilities (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R38.htm </HtmlFileName>
<LongName> 40101 - Disclosure - Organization and Description of the Business (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureOrganizationAndDescriptionOfBusinessDetails </Role>
<ShortName> Organization and Description of the Business (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R39.htm </HtmlFileName>
<LongName> 40201 - Disclosure - Significant Accounting Policies (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureSignificantAccountingPoliciesNarrativeDetails </Role>
<ShortName> Significant Accounting Policies (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R40.htm </HtmlFileName>
<LongName> 40202 - Disclosure - Significant Accounting Policies (Schedule of Interest Income and Interest Expense) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureSignificantAccountingPoliciesScheduleOfInterestIncomeAndInterestExpenseDetails </Role>
<ShortName> Significant Accounting Policies (Schedule of Interest Income and Interest Expense) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R41.htm </HtmlFileName>
<LongName> 40203 - Disclosure - Significant Accounting Policies (Component of Net Trading Revenue Includes Dividend Income and Expense) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureSignificantAccountingPoliciesComponentOfNetTradingRevenueIncludesDividendIncomeAndExpenseDetails </Role>
<ShortName> Significant Accounting Policies (Component of Net Trading Revenue Includes Dividend Income and Expense) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R42.htm </HtmlFileName>
<LongName> 40301 - Disclosure - Fair Value of Financial Instruments (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsNarrativeDetails </Role>
<ShortName> Fair Value of Financial Instruments (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R43.htm </HtmlFileName>
<LongName> 40302 - Disclosure - Fair Value of Financial Instruments (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails </Role>
<ShortName> Fair Value of Financial Instruments (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R44.htm </HtmlFileName>
<LongName> 40303 - Disclosure - Fair Value of Financial Instruments (Fair Value of Derivative Instruments Effect of Changes in Fair Value on Statements of Operations) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsFairValueOfDerivativeInstrumentsEffectOfChangesInFairValueOnStatementsOfOperationsDetails </Role>
<ShortName> Fair Value of Financial Instruments (Fair Value of Derivative Instruments Effect of Changes in Fair Value on Statements of Operations) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R45.htm </HtmlFileName>
<LongName> 40304 - Disclosure - Fair Value of Financial Instruments (Fair Value of Derivative Instruments Gain (Loss) Recognized) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsFairValueOfDerivativeInstrumentsGainLossRecognizedDetails </Role>
<ShortName> Fair Value of Financial Instruments (Fair Value of Derivative Instruments Gain (Loss) Recognized) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R46.htm </HtmlFileName>
<LongName> 40401 - Disclosure - Collateralized Transactions (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureCollateralizedTransactionsDetails </Role>
<ShortName> Collateralized Transactions (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R47.htm </HtmlFileName>
<LongName> 40501 - Disclosure - Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Schedule of Amounts Receivable from and Payable to Brokers, Dealers and Clearing Organizations) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsScheduleOfAmountsReceivableFromAndPayableToBrokersDealersAndClearingOrganizationsDetails </Role>
<ShortName> Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Schedule of Amounts Receivable from and Payable to Brokers, Dealers and Clearing Organizations) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R48.htm </HtmlFileName>
<LongName> 40601 - Disclosure - Investments (Summary of Investments) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureInvestmentsSummaryOfInvestmentsDetails </Role>
<ShortName> Investments (Summary of Investments) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R49.htm </HtmlFileName>
<LongName> 40701 - Disclosure - Goodwill and Intangible Assets (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsNarrativeDetails </Role>
<ShortName> Goodwill and Intangible Assets (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R50.htm </HtmlFileName>
<LongName> 40702 - Disclosure - Goodwill and Intangible Assets (Goodwill and Intangible Assets, Net of Accumulated Amortization) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsGoodwillAndIntangibleAssetsNetOfAccumulatedAmortizationDetails </Role>
<ShortName> Goodwill and Intangible Assets (Goodwill and Intangible Assets, Net of Accumulated Amortization) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R51.htm </HtmlFileName>
<LongName> 40703 - Disclosure - Goodwill and Intangible Assets (Intangible Assets, Net of Accumulated Amortization) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsNetOfAccumulatedAmortizationDetails </Role>
<ShortName> Goodwill and Intangible Assets (Intangible Assets, Net of Accumulated Amortization) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R52.htm </HtmlFileName>
<LongName> 40704 - Disclosure - Goodwill and Intangible Assets (Amortization Expense) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAmortizationExpenseDetails </Role>
<ShortName> Goodwill and Intangible Assets (Amortization Expense) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R53.htm </HtmlFileName>
<LongName> 40705 - Disclosure - Goodwill and Intangible Assets (Estimated Amortization Expense) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsEstimatedAmortizationExpenseDetails </Role>
<ShortName> Goodwill and Intangible Assets (Estimated Amortization Expense) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R54.htm </HtmlFileName>
<LongName> 40801 - Disclosure - Long-Term Debt (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureLongTermDebtNarrativeDetails </Role>
<ShortName> Long-Term Debt (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R55.htm </HtmlFileName>
<LongName> 40802 - Disclosure - Long-Term Debt (Summary Of Long-Term Debt) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureLongTermDebtSummaryOfLongTermDebtDetails </Role>
<ShortName> Long-Term Debt (Summary Of Long-Term Debt) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R56.htm </HtmlFileName>
<LongName> 40803 - Disclosure - Long-Term Debt (Schedule of Recorded Expenses with Respect to Notes) (Details) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.knight.com/role/DisclosureLongTermDebtScheduleOfRecordedExpensesWithRespectToNotesDetails </Role>
<ShortName> Long-Term Debt (Schedule of Recorded Expenses with Respect to Notes) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R57.htm </HtmlFileName>
<LongName> 40901 - Disclosure - Comprehensive Income (Schedule of Comprehensive Income) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureComprehensiveIncomeScheduleOfComprehensiveIncomeDetails </Role>
<ShortName> Comprehensive Income (Schedule of Comprehensive Income) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R58.htm </HtmlFileName>
<LongName> 41001 - Disclosure - Stock-Based Compensation (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureStockBasedCompensationNarrativeDetails </Role>
<ShortName> Stock-Based Compensation (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R59.htm </HtmlFileName>
<LongName> 41002 - Disclosure - Stock-Based Compensation (Employee Compensation and Benefits, Restricted Awards) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureStockBasedCompensationEmployeeCompensationAndBenefitsRestrictedAwardsDetails </Role>
<ShortName> Stock-Based Compensation (Employee Compensation and Benefits, Restricted Awards) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R60.htm </HtmlFileName>
<LongName> 41003 - Disclosure - Stock-Based Compensation (Summary of Restricted Awards Activity) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureStockBasedCompensationSummaryOfRestrictedAwardsActivityDetails </Role>
<ShortName> Stock-Based Compensation (Summary of Restricted Awards Activity) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R61.htm </HtmlFileName>
<LongName> 41004 - Disclosure - Stock-Based Compensation (Compensation Expense Relating to Stock Options) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureStockBasedCompensationCompensationExpenseRelatingToStockOptionsDetails </Role>
<ShortName> Stock-Based Compensation (Compensation Expense Relating to Stock Options) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R62.htm </HtmlFileName>
<LongName> 41005 - Disclosure - Stock-Based Compensation ( Summary of Stock Option Activity) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails </Role>
<ShortName> Stock-Based Compensation ( Summary of Stock Option Activity) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R63.htm </HtmlFileName>
<LongName> 41101 - Disclosure - Income Taxes (Schedule Of Reconciliation Of Federal Statutory Income Tax Rate to the Company's Actual Income Tax Rate From Continuing Operations (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalStatutoryIncomeTaxRateToCompanySActualIncomeTaxRateFromContinuingOperationsDetails </Role>
<ShortName> Income Taxes (Schedule Of Reconciliation Of Federal Statutory Income Tax Rate to the Company's Actual Income Tax Rate From Continuing Operations (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R64.htm </HtmlFileName>
<LongName> 41201 - Disclosure - Writedown Of Assets And Lease Loss Accrual (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureWritedownOfAssetsAndLeaseLossAccrualDetails </Role>
<ShortName> Writedown Of Assets And Lease Loss Accrual (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R65.htm </HtmlFileName>
<LongName> 41301 - Disclosure - Discontinued Operations (Schedule of Losses from Discontinued Operations Net of Tax) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureDiscontinuedOperationsScheduleOfLossesFromDiscontinuedOperationsNetOfTaxDetails </Role>
<ShortName> Discontinued Operations (Schedule of Losses from Discontinued Operations Net of Tax) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R66.htm </HtmlFileName>
<LongName> 41302 - Disclosure - Discontinued Operations (Schedule of Discontinued Operations Assets and Liabilities Recorded in Other Assets and Accrued Expenses and Other Liabilities) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureDiscontinuedOperationsScheduleOfDiscontinuedOperationsAssetsAndLiabilitiesRecordedInOtherAssetsAndAccruedExpensesAndOtherLiabilitiesDetails </Role>
<ShortName> Discontinued Operations (Schedule of Discontinued Operations Assets and Liabilities Recorded in Other Assets and Accrued Expenses and Other Liabilities) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R67.htm </HtmlFileName>
<LongName> 41401 - Disclosure - Earnings Per Share (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureEarningsPerShareNarrativeDetails </Role>
<ShortName> Earnings Per Share (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R68.htm </HtmlFileName>
<LongName> 41402 - Disclosure - Earnings Per Share (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureEarningsPerShareScheduleOfCalculationOfNumeratorAndDenominatorInEarningsPerShareDetails </Role>
<ShortName> Earnings Per Share (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R69.htm </HtmlFileName>
<LongName> 41501 - Disclosure - Significant Clients (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/taxonomy/role/DisclosureSignificantClientsDetails </Role>
<ShortName> Significant Clients (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R70.htm </HtmlFileName>
<LongName> 41601 - Disclosure - Commitments and Contingent Liabilities (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureCommitmentsAndContingentLiabilitiesNarrativeDetails </Role>
<ShortName> Commitments and Contingent Liabilities (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R71.htm </HtmlFileName>
<LongName> 41602 - Disclosure - Commitments and Contingent Liabilities (Schedule of Lease and Contract Obligations) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureCommitmentsAndContingentLiabilitiesScheduleOfLeaseAndContractObligationsDetails </Role>
<ShortName> Commitments and Contingent Liabilities (Schedule of Lease and Contract Obligations) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R72.htm </HtmlFileName>
<LongName> 41603 - Disclosure - Commitments and Contingent Liabilities (Fair Value of Assets or Liability on Future Contract) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureCommitmentsAndContingentLiabilitiesFairValueOfAssetsOrLiabilityOnFutureContractDetails </Role>
<ShortName> Commitments and Contingent Liabilities (Fair Value of Assets or Liability on Future Contract) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R73.htm </HtmlFileName>
<LongName> 41604 - Disclosure - Commitments and Contingent Liabilities (Schedule of Realized Gain (Loss) on Future Contracts) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureCommitmentsAndContingentLiabilitiesScheduleOfRealizedGainLossOnFutureContractsDetails </Role>
<ShortName> Commitments and Contingent Liabilities (Schedule of Realized Gain (Loss) on Future Contracts) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R74.htm </HtmlFileName>
<LongName> 41801 - Disclosure - Business Segments (Income (Loss) from Continuing Operations before Income Taxes (Pre-tax Earnings) and Total Assets by Segment) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureBusinessSegmentsIncomeLossFromContinuingOperationsBeforeIncomeTaxesPreTaxEarningsAndTotalAssetsBySegmentDetails </Role>
<ShortName> Business Segments (Income (Loss) from Continuing Operations before Income Taxes (Pre-tax Earnings) and Total Assets by Segment) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<HtmlFileName> R75.htm </HtmlFileName>
<LongName> 41901 - Disclosure - Subsequent Event (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.knight.com/role/DisclosureSubsequentEventDetails </Role>
<ShortName> Subsequent Event (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<ContainEmbeddedReports> false </ContainEmbeddedReports>
<LongName> All Reports </LongName>
<ReportType> Book </ReportType>
<ShortName> All Reports </ShortName>
</Report>
</MyReports>
<Logs>
<Log type="Info"> Element us-gaap_FeesAndCommissions had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_TradingGainsLosses had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_InterestIncomeExpenseNet had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_InvestmentIncomeNonoperating had a mix of decimals attribute values: 0 -3 -5. </Log>
<Log type="Info"> Element us-gaap_Revenues had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_InterestExpense had a mix of decimals attribute values: 0 -3. </Log>
<Log type="Info"> Element us-gaap_LeaseAndRentalExpense had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element kcg_WriteDownOfAssetsAndLeaseLossAccrualBenefitNet had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_FinancialInstrumentsOwnedAtFairValue had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_LongTermDebt had a mix of decimals attribute values: -3 -8. </Log>
<Log type="Info"> Element us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element kcg_WriteDownOfAssetsAndLeaseLossAccrualBenefitNet had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_ProceedsFromIssuanceOfWarrants had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_InvestmentIncomeNonoperating had a mix of decimals attribute values: 0 -3 -5. </Log>
<Log type="Info"> Element us-gaap_InterestIncomeExpenseNet had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_FinancialInstrumentsOwnedAtFairValue had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_FinancialInstrumentsOwnedAtFairValue had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_TradingGainsLosses had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element kcg_WriteDownOfAssetsAndLeaseLossAccrualBenefitNet had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_InterestExpense had a mix of decimals attribute values: 0 -3. </Log>
<Log type="Info"> Element us-gaap_LongTermDebt had a mix of decimals attribute values: -3 -8. </Log>
<Log type="Info"> Element us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_ProceedsFromIssuanceOfWarrants had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_LongTermDebt had a mix of decimals attribute values: -3 -8. </Log>
<Log type="Info"> Element kcg_WriteDownOfAssetsAndLeaseLossAccrualBenefitNet had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_LeaseAndRentalExpense had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_Revenues had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> Element us-gaap_FeesAndCommissions had a mix of decimals attribute values: -3 -5. </Log>
<Log type="Info"> 'Monetary' elements on report '40302 - Disclosure - Fair Value of Financial Instruments (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40303 - Disclosure - Fair Value of Financial Instruments (Fair Value of Derivative Instruments Effect of Changes in Fair Value on Statements of Operations) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40304 - Disclosure - Fair Value of Financial Instruments (Fair Value of Derivative Instruments Gain (Loss) Recognized) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40401 - Disclosure - Collateralized Transactions (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40501 - Disclosure - Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Schedule of Amounts Receivable from and Payable to Brokers, Dealers and Clearing Organizations) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40601 - Disclosure - Investments (Summary of Investments) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40801 - Disclosure - Long-Term Debt (Narrative) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40802 - Disclosure - Long-Term Debt (Summary Of Long-Term Debt) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '40901 - Disclosure - Comprehensive Income (Schedule of Comprehensive Income) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '41301 - Disclosure - Discontinued Operations (Schedule of Losses from Discontinued Operations Net of Tax) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '41402 - Disclosure - Earnings Per Share (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Shares' elements on report '41402 - Disclosure - Earnings Per Share (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '41601 - Disclosure - Commitments and Contingent Liabilities (Narrative) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '41801 - Disclosure - Business Segments (Income (Loss) from Continuing Operations before Income Taxes (Pre-tax Earnings) and Total Assets by Segment) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> Process Flow-Through: 00100 - Statement - Consolidated Statements of Operations </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' </Log>
<Log type="Info"> Process Flow-Through: 00200 - Statement - Consolidated Statements of Financial Condition </Log>
<Log type="Info"> Process Flow-Through: Removing column 'Jun. 30, 2010' </Log>
<Log type="Info"> Process Flow-Through: Removing column 'Dec. 31, 2009' </Log>
<Log type="Info"> Process Flow-Through: 00205 - Statement - Consolidated Statements of Financial Condition (Parenthetical) </Log>
<Log type="Info"> Process Flow-Through: 00300 - Statement - Consolidated Statements of Cash Flows </Log>
</Logs>
<InputFiles>
<File> kcg-20110630.xml </File>
<File> kcg-20110630.xsd </File>
<File> kcg-20110630_cal.xml </File>
<File> kcg-20110630_def.xml </File>
<File> kcg-20110630_lab.xml </File>
<File> kcg-20110630_pre.xml </File>
</InputFiles>
<SupplementalFiles/>
<BaseTaxonomies/>
<HasPresentationLinkbase> true </HasPresentationLinkbase>
<HasCalculationLinkbase> true </HasCalculationLinkbase>
</FilingSummary>

↑Top
Filing Submission 0001193125-11-216460   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
About — Privacy — Redactions — Help — Sat., Apr. 20, 2:51:47.2am ET