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Note Guarantees (Credit recourse) - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Guarantee on loans sold or serviced with credit recourse      
Guarantor Obligations [Line Items]      
Valuation Allowances And Reserves Balance $ 54,489 $ 58,663 $ 59,438
Serviced Mortgage Loans      
Guarantor Obligations [Line Items]      
Loans serviced 18,000,000 20,600,000  
Loans with Recourse      
Guarantor Obligations [Line Items]      
Loans serviced 1,700,000 1,900,000  
Loans with Recourse | Serviced Mortgage Loans      
Guarantor Obligations [Line Items]      
Repurchased Loans $ 44,000 $ 59,000