Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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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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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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 - Goodwill by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2013	Mar. 01, 2013
Goodwill [Roll Forward]
Beginning Balance		$ 657,737us-gaap_Goodwill	$ 580,378us-gaap_Goodwill
Impairment	(82,269)us-gaap_GoodwillImpairmentLoss	(82,269)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Adjustments			28,800
Ending Balance		575,468us-gaap_Goodwill	657,737us-gaap_Goodwill	580,378us-gaap_Goodwill
Acquisition of ResCap Net Assets [Member]
Goodwill [Roll Forward]
Beginning Balance					47,600
Acquisitions			47,648
Ending Balance					47,600
Acquistion of Ally Bank Net Assets [Member]
Goodwill [Roll Forward]
Beginning Balance						100
Acquisitions			99
Ending Balance						100
Acquisition of MetLife Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			812
Servicing [Member]
Goodwill [Roll Forward]
Beginning Balance		432,267	431,455
Impairment		0
Adjustments			0
Ending Balance			432,267
Servicing [Member] \| Acquisition of ResCap Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Servicing [Member] \| Acquistion of Ally Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Servicing [Member] \| Acquisition of MetLife Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			812
Originations [Member]
Goodwill [Roll Forward]
Beginning Balance		47,747	0
Impairment		0
Adjustments			0
Ending Balance			47,747
Originations [Member] \| Acquisition of ResCap Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			47,648
Originations [Member] \| Acquistion of Ally Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			99
Originations [Member] \| Acquisition of MetLife Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Reverse Mortgage [Member]
Goodwill [Roll Forward]
Beginning Balance		138,808	110,008
Impairment		(82,269)
Adjustments			28,800
Ending Balance		56,539	138,808
Reverse Mortgage [Member] \| Acquisition of ResCap Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Reverse Mortgage [Member] \| Acquistion of Ally Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Reverse Mortgage [Member] \| Acquisition of MetLife Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Asset Receivables Management (ARM) [Member]
Goodwill [Roll Forward]
Beginning Balance		34,518	34,518
Impairment		0
Adjustments			0
Ending Balance			34,518
Asset Receivables Management (ARM) [Member] \| Acquisition of ResCap Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Asset Receivables Management (ARM) [Member] \| Acquistion of Ally Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Asset Receivables Management (ARM) [Member] \| Acquisition of MetLife Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Insurance [Member]
Goodwill [Roll Forward]
Beginning Balance		4,397	4,397
Impairment		0
Adjustments			0
Ending Balance		4,397	4,397
Insurance [Member] \| Acquisition of ResCap Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Insurance [Member] \| Acquistion of Ally Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			0
Insurance [Member] \| Acquisition of MetLife Bank Net Assets [Member]
Goodwill [Roll Forward]
Acquisitions			$ 0