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Summary of Activity in Allowance for Losses on Residential Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
(Reversal of provision) provision for loan losses $ 315 $ 3,272 $ (967) $ 1,233
Residential Loans
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 25,571 29,064 25,427 28,504
Charge-offs, net (994) (1,751) (1,478) (2,545)
(Reversal of provision) provision for loan losses (605) (4,163) 23 (2,809)
Balance at End of Period $ 23,972 $ 23,150 $ 23,972 $ 23,150