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Note Guarantees (Credit recourse) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Guarantee on loans sold or serviced with credit recourse                
Guarantor Obligations [Line Items]                
Valuation Allowances And Reserves Balance $ 52,052 $ 56,280 $ 52,052 $ 56,280 $ 49,395 $ 54,489 $ 56,931 $ 58,663
Serviced Mortgage Loans                
Guarantor Obligations [Line Items]                
Loans serviced 17,100,000   17,100,000     18,000,000    
Loans with Recourse                
Guarantor Obligations [Line Items]                
Loans serviced 1,500,000   1,500,000     $ 1,700,000    
Loans with Recourse | Serviced Mortgage Loans                
Guarantor Obligations [Line Items]                
Repurchased Loans $ 7,000 $ 11,000 $ 22,000 $ 34,000