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Fair Value - Summary of Assets and Liabilities in Each Level of Fair Value Hierarchy (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Feb. 10, 2018
Feb. 09, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets          
Residential loans at fair value $ 9,146,956     $ 10,725,232  
Receivables related to Non-Residual Trusts 1,945     5,608  
Servicing rights carried at fair value 563,144   $ 688,466 714,774 $ 949,593
Derivative instruments 18,387     29,394  
Liabilities          
Derivative instruments 13,737     1,250  
Mortgage-backed debt related to Non-Residual Trusts 131,313     348,682  
HMBS related obligations 7,264,821     9,175,128  
Liabilities   $ 12,137,344      
Reverse Loans [Member]          
Assets          
Residential loans at fair value 8,202,775     9,789,444  
Mortgage Loans Related To Non-Residual Trusts [Member]          
Assets          
Residential loans at fair value 117,410     301,435  
Mortgage Loans Related To Residual Trusts and Other Loans Held for Investment [Member]          
Assets          
Residential loans at fair value 1,044     0  
Mortgage Loans Held for Sale [Member]          
Assets          
Residential loans at fair value 777,287     588,553  
Charged-off Loans [Member]          
Assets          
Residential loans at fair value 48,440     45,800  
Recurring Measurement Basis [Member] | Level 2 [Member]          
Assets          
Servicing rights carried at fair value 14,565     0  
Derivative instruments 1,770     2,757  
Assets 793,561     591,242  
Liabilities          
Derivative instruments 13,410     981  
Servicing rights related liabilities 0     32  
Liabilities 13,410     1,013  
Recurring Measurement Basis [Member] | Level 2 [Member] | Mortgage Loans Held for Sale [Member]          
Assets          
Residential loans at fair value 777,226     588,485  
Recurring Measurement Basis [Member] | Level 3 [Member]          
Assets          
Receivables related to Non-Residual Trusts 1,945     5,608  
Servicing rights carried at fair value 548,579     714,774  
Assets 8,936,871     10,883,766  
Liabilities          
Mortgage-backed debt related to Non-Residual Trusts 131,313     348,682  
HMBS related obligations 7,264,821     9,175,128  
Liabilities 7,396,461     9,524,079  
Recurring Measurement Basis [Member] | Level 3 [Member] | Reverse Loans [Member]          
Assets          
Residential loans at fair value 8,202,775     9,789,444  
Recurring Measurement Basis [Member] | Level 3 [Member] | Mortgage Loans Related To Non-Residual Trusts [Member]          
Assets          
Residential loans at fair value 117,410     301,435  
Recurring Measurement Basis [Member] | Level 3 [Member] | Mortgage Loans Related To Residual Trusts and Other Loans Held for Investment [Member]          
Assets          
Residential loans at fair value 1,044     0  
Recurring Measurement Basis [Member] | Level 3 [Member] | Mortgage Loans Held for Sale [Member]          
Assets          
Residential loans at fair value 61     68  
Recurring Measurement Basis [Member] | Level 3 [Member] | Charged-off Loans [Member]          
Assets          
Residential loans at fair value 48,440     45,800  
Interest Rate Lock Commitments [Member]          
Assets          
Derivative instruments 16,617     26,637  
Liabilities          
Derivative instruments 327     269  
Interest Rate Lock Commitments [Member] | Recurring Measurement Basis [Member] | Level 3 [Member]          
Assets          
Derivative instruments 16,617     26,637  
Liabilities          
Derivative instruments $ 327     $ 269