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Securities Financing Including Redeemable Preferred Stocks - Summary of Redeemable Preferred Stock (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Stockholders Equity [Line Items]    
Accumulated dividend   $ 22,351
Series E Redeemable Preferred Stock [Member]    
Stockholders Equity [Line Items]    
Beginning balance   $ 177,272
Beginning balance, shares   210,000
Accretion relating to liquidation preference on preferred stock   $ 11,475
Accretion for discount and issuance costs on preferred stock   5,145
Accumulated dividend $ 7,372 22,351
Redemption of preferred stock   $ (70,232)
Redemption of preferred stock, shares   (70,232)
Dividends paid   $ (8,028)
Ending balance $ 137,983 $ 137,983
Ending balance, shares 139,768 139,768
Series F Redeemable Preferred Stock [Member]    
Stockholders Equity [Line Items]    
Beginning balance, shares   1
Ending balance, shares 1 1