The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill impairment charges	$ 13,200	$ 91,000	$ 215,400	$ 151,000	$ 56,500	$ 319,551	$ 207,557
Amortization expense for intangible assets						12,000	$ 19,500	$ 18,900
Originations [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount				52.00%			52.00%
Goodwill impairment charges						0	$ 0
Servicing [Member]
Goodwill [Line Items]
Goodwill impairment charges	13,200	91,000	215,400			319,551	$ 151,018
Servicing [Member] \| ARM Reporting Unit [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount				5.00%			5.00%
Goodwill impairment charges	$ 13,200		21,300
Servicing [Member] \| Servicing Reporting Unit [Member]
Goodwill [Line Items]
Goodwill impairment charges		91,000	$ 194,100	$ 151,000
Reverse Mortgage [Member]
Goodwill [Line Items]
Goodwill impairment charges					$ 56,500	$ 0	$ 56,539
Intangible assets impairment charges		$ 6,700