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Servicing of Residential Loans - Schedule of Sensitivity Analysis of Fair Value, Servicing Rights Carried at Fair Value (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sensitivity Analysis of Servicing Rights at Fair Value [Line Items]    
10% adverse change on weighted-average discount rate $ (20,815) $ (29,892)
10% adverse change in weighted-average conditional prepayment rate (19,192) (27,261)
10% adverse change in weighted-average conditional default rate (25,609) (31,610)
20% adverse change in weighted-average discount rate (40,169) (57,517)
20% adverse change in weighted-average conditional prepayment rate (36,967) (52,551)
20% adverse change in weighted-average conditional default rate $ (51,343) $ (63,832)
Minimum [Member]    
Sensitivity Analysis of Servicing Rights at Fair Value [Line Items]    
Adverse Change In Assumptions Percent 10.00%  
Maximum [Member]    
Sensitivity Analysis of Servicing Rights at Fair Value [Line Items]    
Adverse Change In Assumptions Percent 20.00%  
Discount Rate [Member] | Servicing Rights Carried at Fair Value [Member]    
Sensitivity Analysis of Servicing Rights at Fair Value [Line Items]    
Servicing Rights Carried at Fair Value 0.1078 0.1192
Conditional Prepayment Rate [Member] | Servicing Rights Carried at Fair Value [Member]    
Sensitivity Analysis of Servicing Rights at Fair Value [Line Items]    
Servicing Rights Carried at Fair Value 0.1079 0.1110
Conditional Default Rate [Member] | Servicing Rights Carried at Fair Value [Member]    
Sensitivity Analysis of Servicing Rights at Fair Value [Line Items]    
Servicing Rights Carried at Fair Value 0.0077 0.0091