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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, 2013
Fair Value Measurement Assets [Member]
  
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]  
Cash $ 47,869
Cash and securities segregated for regulatory and other purposes 20,072
Deposits with clearing organization 21,077
Receivable from brokers and clearing organizations  
Deposits paid for securities borrowed 186,361
Receivables from brokers 45,507
Securities failed to deliver 30,191
Omnibus accounts 28,358
Other 538
Total Receivable from brokers and clearing organizations 290,955
Receivable from customers 881,514
Notes receivable 45,030
Mortgage servicing rights (MSRs) 34,350
Mortgage receivable 25,685
Loan receivable 7,126
Escrow deposit 25,000
Drafts payable 44,927
Bank call loans 204,000
Fair Value Measurement Liabilities [Member]
  
Payables to brokers and clearing organizations  
Deposits received for securities loaned 175,601
Securities failed to receive 32,061
Clearing organizations and other 7,950
Total Payables to brokers and clearing organizations 215,612
Payables to customers 607,034
Securities sold under agreements to repurchase 544,136
Accounts payable and other liabilities  
Warehouse payable 24,374
Loan payable 7,126
Payable to third party 25,000
Senior secured note 209,742
Carrying Value [Member] | Fair Value Measurement Assets [Member]
  
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]  
Cash 47,869
Cash and securities segregated for regulatory and other purposes 20,072
Deposits with clearing organization 21,077
Receivable from brokers and clearing organizations  
Deposits paid for securities borrowed 186,361
Receivables from brokers 45,507
Securities failed to deliver 30,191
Omnibus accounts 28,358
Other 538
Total Receivable from brokers and clearing organizations 290,955
Receivable from customers 881,514
Notes receivable 45,030
Mortgage servicing rights (MSRs) 27,187
Mortgage receivable 25,685
Loan receivable 7,126
Escrow deposit 25,000
Drafts payable 44,927
Bank call loans 204,000
Carrying Value [Member] | Fair Value Measurement Liabilities [Member]
  
Payables to brokers and clearing organizations  
Deposits received for securities loaned 175,601
Securities failed to receive 32,061
Clearing organizations and other 7,950
Total Payables to brokers and clearing organizations 215,612
Payables to customers 607,034
Securities sold under agreements to repurchase 544,136
Accounts payable and other liabilities  
Warehouse payable 24,374
Loan payable 7,126
Payable to third party 25,000
Senior secured note 195,000
Fair Value [Member] | Fair Value Measurement Assets [Member]
  
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]  
Cash 47,869
Cash and securities segregated for regulatory and other purposes 20,072
Deposits with clearing organization 21,077
Receivable from brokers and clearing organizations  
Deposits paid for securities borrowed 186,361
Receivables from brokers 45,507
Securities failed to deliver 30,191
Omnibus accounts 28,358
Other 538
Total Receivable from brokers and clearing organizations 290,955
Receivable from customers 881,514
Notes receivable 45,030
Mortgage servicing rights (MSRs) 34,350
Mortgage receivable 25,685
Loan receivable 7,126
Escrow deposit 25,000
Drafts payable 44,927
Bank call loans 204,000
Fair Value [Member] | Fair Value Measurement Liabilities [Member]
  
Payables to brokers and clearing organizations  
Deposits received for securities loaned 175,601
Securities failed to receive 32,061
Clearing organizations and other 7,950
Total Payables to brokers and clearing organizations 215,612
Payables to customers 607,034
Securities sold under agreements to repurchase 544,136
Accounts payable and other liabilities  
Warehouse payable 24,374
Loan payable 7,126
Payable to third party 25,000
Senior secured note 209,742
Level 1 [Member] | Fair Value Measurement Assets [Member]
  
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]  
Cash 47,869
Cash and securities segregated for regulatory and other purposes 20,072
Deposits with clearing organization 21,077
Receivable from brokers and clearing organizations  
Escrow deposit 25,000
Drafts payable 44,927
Bank call loans 204,000
Level 1 [Member] | Fair Value Measurement Liabilities [Member]
  
Accounts payable and other liabilities  
Payable to third party 25,000
Level 2 [Member] | Fair Value Measurement Assets [Member]
  
Receivable from brokers and clearing organizations  
Deposits paid for securities borrowed 186,361
Receivables from brokers 45,507
Securities failed to deliver 30,191
Omnibus accounts 28,358
Other 538
Total Receivable from brokers and clearing organizations 290,955
Receivable from customers 881,514
Mortgage receivable 25,685
Level 2 [Member] | Fair Value Measurement Liabilities [Member]
  
Payables to brokers and clearing organizations  
Deposits received for securities loaned 175,601
Securities failed to receive 32,061
Clearing organizations and other 7,950
Total Payables to brokers and clearing organizations 215,612
Payables to customers 607,034
Securities sold under agreements to repurchase 544,136
Accounts payable and other liabilities  
Warehouse payable 24,374
Senior secured note 209,742
Level 3 [Member] | Fair Value Measurement Assets [Member]
  
Receivable from brokers and clearing organizations  
Notes receivable 45,030
Mortgage servicing rights (MSRs) 34,350
Loan receivable 7,126
Level 3 [Member] | Fair Value Measurement Liabilities [Member]
  
Accounts payable and other liabilities  
Loan payable $ 7,126