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Summary of Activity in Allowance for Losses on Residential Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
(Reversal of provision) provision for loan losses $ (1,596) $ 1,727 $ (629) $ 493
Residential Loans
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 23,972 23,150 25,427 28,504
Charge-offs, net (1,355) (818) (2,833) (3,363)
(Reversal of provision) provision for loan losses (708) 883 (685) (1,926)
Balance at End of Period $ 21,909 $ 23,215 $ 21,909 $ 23,215