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Fair Value - Summary of Reconciliation of the Changes in Fair Value of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Footnote) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 01, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Proceeds from sale of mortgage servicing rights accounted for as financing     $ (54,601) $ 0 $ 0
Gain (loss) attributable to derivatives     100 300 (1,000)
Losses attributable to MSRs held     (4,500) $ (78,300) $ (90,300)
NRZ [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers upon receipt of consents, MSRs $ 15,900,000        
Proceeds from sale of mortgage servicing rights accounted for as financing     (54,600)    
Decrease in fair value of portion of Financing liability - MSRs pledged   $ 37,600 $ 42,000    
Contractual servicing fee rate of transferred MSRs     0.334%    
Weighted average contractual servicing fee rates     0.471%