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Financial Instruments Owned and Pledged as Collateral at Fair Value, Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase Summary of Assets, Liabilities and Collateral Received or Pledged (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value $ 76,773 $ 56,311
Securities Purchased Under Agreements to Resell 0 19,134
Securities Sold Under Agreements to Repurchase (76,874) (75,563)
Asset (Liability) Balance [Member]
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value 76,773 56,311
Securities Purchased Under Agreements to Resell 0 19,134
Total Assets 76,773 75,445
Securities Sold Under Agreements to Repurchase (76,874) (75,563)
Market Value of Collateral Received or (Pledged) [Member]
    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities Purchased Under Agreements to Resell 0 19,112
Securities Sold Under Agreements to Repurchase $ (76,972) $ (75,708)