Acquisitions - Estimate of Identifiable Intangible Assets Recognized at Acquisition with Corresponding Weighted-Average Amortization Periods (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Reverse Mortgage Solutions, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 33,900
Weighted- Average Amortization Period	5 years 7 months 6 days
Reverse Mortgage Solutions, Inc. [Member] | Institutional Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	11,900
Weighted- Average Amortization Period	10 years
Reverse Mortgage Solutions, Inc. [Member] | Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	6,700
Weighted- Average Amortization Period	1 year 9 months 18 days
Reverse Mortgage Solutions, Inc. [Member] | Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	1,200
Weighted- Average Amortization Period	4 years 8 months 12 days
Reverse Mortgage Solutions, Inc. [Member] | Non-compete agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	1,000
Weighted- Average Amortization Period	1 year 6 months
Reverse Mortgage Solutions, Inc. [Member] | Total intangible assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	20,800
Weighted- Average Amortization Period	6 years 7 months 6 days
Reverse Mortgage Solutions, Inc. [Member] | Internally-developed software [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	13,100
Weighted- Average Amortization Period	4 years
Security One Lending [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	11,000
Weighted- Average Amortization Period	12 years 4 months 24 days
Security One Lending [Member] | Institutional Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	4,700
Weighted- Average Amortization Period	1 year 7 months 6 days
Security One Lending [Member] | Non-compete agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	500
Weighted- Average Amortization Period	1 year 9 months 18 days
Security One Lending [Member] | Licenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	5,000
Weighted- Average Amortization Period	25 years
Security One Lending [Member] | Trademarks and Trade Name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	800
Weighted- Average Amortization Period	4 years 4 months 24 days
Green Tree Acquisition [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	273,416
Weighted- Average Amortization Period	4 years 7 months 6 days
Green Tree Acquisition [Member] | Institutional Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	17,000
Weighted- Average Amortization Period	1 year 3 months 18 days
Green Tree Acquisition [Member] | Customer relationships [Member] | Servicing [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	69,362
Weighted- Average Amortization Period	7 years
Green Tree Acquisition [Member] | Customer relationships [Member] | Insurance [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	34,564
Weighted- Average Amortization Period	7 years
Green Tree Acquisition [Member] | Customer relationships [Member] | Asset Receivables Management [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	29,141
Weighted- Average Amortization Period	3 years 2 months 12 days
Green Tree Acquisition [Member] | Total intangible assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	150,067
Weighted- Average Amortization Period	5 years 7 months 6 days
Green Tree Acquisition [Member] | Internally-developed software [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 123,349
Weighted- Average Amortization Period	3 years 4 months 24 days