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Financial Instruments - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Securities purchased under agreements to resell $ 250,548 $ 184,825
Fair Value Measurement Liabilities [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Drafts payable 41,306 48,198
Bank call loans 197,000 118,200
Deposits received for securities loaned 209,153 211,621
Securities failed to receive 26,071 5,346
Clearing organizations and other 140,280 6,348
Total payables to brokers, dealers and clearing organizations 375,504 223,315
Payables to customers 629,564 626,564
Securities sold under agreements to repurchase 705,727 757,491
Warehouse payable 2,417 54,614
Payable to third party 25,006 25,006
Senior secured notes 208,285 208,529
Fair Value Measurement Assets [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 36,800 38,026
Cash segregated for regulatory and other purposes 24,782 24,828
Deposits with clearing organization 16,341 13,187
Deposits paid for securities borrowed 231,990 274,127
Receivables from brokers 42,767 49,803
Securities failed to deliver 29,298 9,628
Clearing organizations 18 27
Omnibus accounts 16,628 18,086
Other 9,662 13,202
Total Receivable from brokers, dealers and clearing organizations 330,363 364,873
Receivable from customers 954,650 868,869
Securities purchased under agreements to resell 548 825
Mortgage servicing rights (MSRs) 40,882 40,084
Escrow deposit 25,006 25,006
Carrying Value [Member] | Fair Value Measurement Liabilities [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Drafts payable   48,198
Bank call loans 197,000 118,200
Deposits received for securities loaned 209,153 211,621
Securities failed to receive 26,071 5,346
Clearing organizations and other 140,280 6,348
Total payables to brokers, dealers and clearing organizations 375,504 223,315
Payables to customers 629,564 626,564
Securities sold under agreements to repurchase 705,727 757,491
Warehouse payable 2,417 54,614
Payable to third party 25,006 25,006
Senior secured notes 195,000 195,000
Carrying Value [Member] | Fair Value Measurement Assets [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 36,800 38,026
Cash segregated for regulatory and other purposes 24,782 24,828
Deposits with clearing organization 16,341 13,187
Deposits paid for securities borrowed 231,990 274,127
Receivables from brokers 42,767 49,803
Securities failed to deliver 29,298 9,628
Clearing organizations 18 27
Omnibus accounts 16,628 18,086
Other 9,662 13,202
Total Receivable from brokers, dealers and clearing organizations 330,363 364,873
Receivable from customers 954,650 868,869
Securities purchased under agreements to resell 548 825
Mortgage servicing rights (MSRs) 29,226 28,879
Escrow deposit 25,006 25,006
Fair Value [Member] | Fair Value Measurement Liabilities [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Drafts payable 41,306 48,198
Bank call loans 197,000 118,200
Deposits received for securities loaned 209,153 211,621
Securities failed to receive 26,071 5,346
Clearing organizations and other 140,280 6,348
Total payables to brokers, dealers and clearing organizations 375,504 223,315
Payables to customers 629,564 626,564
Securities sold under agreements to repurchase 705,727 757,491
Warehouse payable 2,417 54,614
Payable to third party 25,006 25,006
Senior secured notes 208,285 208,529
Fair Value [Member] | Fair Value Measurement Assets [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 36,800 38,026
Cash segregated for regulatory and other purposes 24,782 24,828
Deposits with clearing organization 16,341 13,187
Deposits paid for securities borrowed 231,990 274,127
Receivables from brokers 42,767 49,803
Securities failed to deliver 29,298 9,628
Clearing organizations 18 27
Omnibus accounts 16,628 18,086
Other 9,662 13,202
Total Receivable from brokers, dealers and clearing organizations 330,363 364,873
Receivable from customers 954,650 868,869
Securities purchased under agreements to resell 548 825
Mortgage servicing rights (MSRs) 40,882 40,084
Escrow deposit 25,006 25,006
Level 1 [Member] | Fair Value Measurement Liabilities [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Drafts payable 41,306 48,198
Bank call loans 197,000 118,200
Payable to third party 25,006 25,006
Level 1 [Member] | Fair Value Measurement Assets [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 36,800 38,026
Cash segregated for regulatory and other purposes 24,782 24,828
Deposits with clearing organization 16,341 13,187
Securities purchased under agreements to resell 548 825
Escrow deposit 25,006 25,006
Level 2 [Member] | Fair Value Measurement Liabilities [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Deposits received for securities loaned 209,153 211,621
Securities failed to receive 26,071 5,346
Clearing organizations and other 140,280 6,348
Total payables to brokers, dealers and clearing organizations 375,504 223,315
Payables to customers 629,564 626,564
Securities sold under agreements to repurchase 705,727 757,491
Warehouse payable 2,417 54,614
Senior secured notes 208,285 208,529
Level 2 [Member] | Fair Value Measurement Assets [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Deposits paid for securities borrowed 231,990 274,127
Receivables from brokers 42,767 49,803
Securities failed to deliver 29,298 9,628
Clearing organizations 18 27
Omnibus accounts 16,628 18,086
Other 9,662 13,202
Total Receivable from brokers, dealers and clearing organizations 330,363 364,873
Receivable from customers 954,650 868,869
Level 3 [Member] | Fair Value Measurement Assets [Member]
    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Mortgage servicing rights (MSRs) $ 40,882 $ 40,084