For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

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Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Servicing of Residential Loans - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Servicing of Residential Loans [Line Items]
Servicing revenue and fees	$ 66,209	$ 443,872		$ 634,944
Customer One [Member] \| Customer Concentration Risk [Member] \| Unpaid Principal Balance Subserviced [Member]
Servicing of Residential Loans [Line Items]
Concentration percentage			73.00%	69.00%
Customer Two [Member] \| Customer Concentration Risk [Member] \| Unpaid Principal Balance Subserviced [Member]
Servicing of Residential Loans [Line Items]
Concentration percentage			16.00%	21.00%
Fannie Mae [Member] \| Customer Concentration Risk [Member]
Servicing of Residential Loans [Line Items]
Servicing revenue and fees	33,800	239,000		$ 306,900
Ginnie Mae [Member] \| Customer Concentration Risk [Member]
Servicing of Residential Loans [Line Items]
Servicing revenue and fees	$ 14,200	87,600		96,900
Freddie Mac [Member] \| Customer Concentration Risk [Member]
Servicing of Residential Loans [Line Items]
Servicing revenue and fees				67,500
Mortgage Loan Class [Member]
Servicing of Residential Loans [Line Items]
Fair value of servicing rights		51,700	$ 51,700	59,700
Reverse Loan Class [Member]
Servicing of Residential Loans [Line Items]
Fair value of servicing rights		$ 3,100	$ 3,100	$ 4,800