Acquisitions - Additional Information (Detail) (USD $)			1 Months Ended		6 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Mar. 01, 2013 Ally Bank Net Assets [Member]	Jun. 30, 2013 Ally Bank Net Assets [Member]	Jun. 30, 2013 Ally Bank Net Assets [Member] Institutional relationships [Member]	Jan. 31, 2013 ResCap Acquisition [Member]	Jun. 30, 2013 ResCap Acquisition [Member]	Dec. 31, 2012 ResCap Acquisition [Member]	Jun. 30, 2013 ResCap Acquisition [Member]	Mar. 31, 2013 MetLife Bank Net Assets [Member]	Jun. 30, 2013 MetLife Bank Net Assets [Member]	Jun. 30, 2013 MetLife Bank Net Assets [Member]	Jun. 30, 2013 Bank of America Asset Purchase [Member]	Jan. 31, 2013 Bank of America Asset Purchase [Member]	Nov. 01, 2012 Reverse Mortgage Solutions, Inc. [Member]	Jun. 30, 2013 Security One Lending [Member]	Jun. 30, 2013 Security One Lending [Member]	Dec. 31, 2012 Security One Lending [Member]
Business Acquisition [Line Items]
Purchase price						$ 487,200,000								$ 495,700,000
Business acquisition, consideration paid			100,000			492,000,000				1,000,000			481,600,000
Business acquisition, payments						477,000,000		15,000,000
Purchase price adjustments period						120 days
Loan unpaid principle balance							42,300,000,000		42,300,000,000					84,400,000,000
Purchase price adjustments period						60 days
Purchase price adjustments period						30 days
Purchase consideration				100,000			487,200,000		487,200,000						136,300,000
Servicer and protective advances acquired, fair value							186,200,000		186,200,000
Servicer and protective advances acquired, gross contractual amounts receivable							195,900,000		195,900,000
Servicer and protective advances acquired, not expected to be collected							9,700,000		9,700,000
Goodwill allocated expected tax deductible							45,700,000		45,700,000
Amount of revenues included in comprehensive income (loss)							318,000,000		398,400,000
Amount of net income included in comprehensive income (loss)							121,500,000		135,200,000
Transaction-related expenses									3,000,000		100,000	200,000
Weighted-average amortization period of intangible assets					1 year				4 years 7 months 6 days
Business acquisition allocated to goodwill	654,565,000	580,378,000		99,000						800,000
Business acquisition allocated to premises and equipment				201,000						400,000
Business acquisition allocated to payables and accrued liabilities				1,437,000						200,000
Business combinations and asset acquisitions deferred purchase price													14,100,000
Company purchased servicer advances													654,400,000
Contingent earn-out payments																		10,900,000
Estimated liability for contingent earn-out payments	10,900,000	6,100,000														10,900,000	10,900,000	6,100,000
Loss related to adjustment of contingent earnout payments																$ 1,100,000	$ 4,800,000