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Amounts Payable to Brokers, Dealers and Clearing Organizations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Due To From Brokers Dealers And Clearing Organizations [Line Items]    
Payable arising from unsettled securities transactions, net $ 29,005  
Payable to clearing organizations 3,064 2,320
Securities failed to receive 1,402 499
Other 4,491 15,700
Brokers, dealers and clearing organizations $ 37,962 $ 18,519