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Fair Value - Schedule of Carrying Amounts and Estimated Fair Values of Financial Assets and Liabilities Not Recorded at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial assets    
Residential loans at amortized cost, net $ 473,880 $ 985,454
Servicer and protective advances, net 440,497 813,433
Financial liabilities    
Servicing advance liabilities 218,291 483,462
Corporate debt 1,133,218 1,995,793
Mortgage-backed debt carried at amortized cost 0 387,200
Liabilities subject to compromise 0 781,130
Level 3 [Member] | Carrying Amount [Member]    
Financial assets    
Residential loans at amortized cost, net 7,428 443,056
Servicer and protective advances, net 440,497 813,433
Financial liabilities    
Servicing advance liabilities 217,991 478,838
Mortgage-backed debt carried at amortized cost 0 387,200
Level 3 [Member] | Estimated Fair Value [Member]    
Financial assets    
Residential loans at amortized cost, net 7,186 432,518
Servicer and protective advances, net 438,032 778,007
Financial liabilities    
Servicing advance liabilities 218,291 483,462
Mortgage-backed debt carried at amortized cost 0 391,539
Level 2 [Member] | Carrying Amount [Member]    
Financial liabilities    
Corporate debt 1,133,218 1,994,411
Liabilities subject to compromise   781,100
Level 2 [Member] | Estimated Fair Value [Member]    
Financial liabilities    
Corporate debt $ 850,647 1,553,076
Liabilities subject to compromise   $ 358,800