Servicing of Residential Loans - Schedule of Net Servicing Revenue and Fees (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Servicing fees	$ 133,393	$ 177,754
Incentive and performance fees	15,154	19,772
Ancillary and other fees	23,243	24,609
Servicing revenue and fees	171,790	222,135
Amortization of servicing rights	(5,025)	(4,611)
Change in fair value of servicing rights	(53,516)	(326,580)
Change in fair value of servicing rights related liabilities	(62)	3,294
Net servicing revenue and fees	113,187	(105,762)
Late fees	15,600	15,800
Amortization of a servicing liability	800	1,200
Impairment of a servicing liability	1,800
Interest expense	$ 60,410	64,248
Servicing Rights Related Liabilities
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Interest expense		3,900
Corporate Joint Venture \| Sub-servicing Performed For WCO
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Sub-servicing fees related to servicing assets held by WCO		1,000
Incentive, performance, ancillary and other fees related to servicing assets held by WCO		200
Corporate Joint Venture \| Sale Of Servicing Rights To WCO
Fees Earned in Exchange for Servicing Financial Assets [Line Items]
Servicing fees		$ 1,200

All amounts that are due to the servicer of a financial asset, excluding contractually specified servicing fees and late fees.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
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All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

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The total amount of contractually specified servicing fees, late fees, and ancillary fees earned for each period for which results of operations are presented.

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Amount of fee and commission revenue classified as other.

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Amount of the cost of borrowed funds accounted for as interest expense.

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All amounts that are due to the servicer of a financial asset as a result of the debt holder not meeting the monthly payment terms.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Amount of amortization 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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The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

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Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

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Amount of amortization of contract to service financial assets under which estimated future revenue from contractually specified servicing fees, late charges, and other ancillary revenues are not expected to adequately compensate the servicer for performing the servicing.

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Amount of other increase (decrease) to contract to service financial assets under which estimated future revenue from contractually specified servicing fees, late charges, and other ancillary revenues are not expected to adequately compensate the servicer for performing the servicing.

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The net change in fair value of servicing rights related liabilities, which include excess servicing spread liabilities and servicing rights financing, as a result of changes in the inputs or assumptions used in the valuation model to calculate the fair value of the servicing liability, as well as other changes in fair value.

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