Business and Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended					6 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2012 Accounts	Jun. 30, 2013 Accounts	Jun. 30, 2012 Cash flows from operating activities [Member]	Jun. 30, 2012 Cash flows used in investing activities [Member]	Jun. 30, 2012 Cash Flows Used In Financing Activities [Member]	Jun. 30, 2013 Reverse Mortgage Solutions, Inc. [Member]	Nov. 01, 2012 Reverse Mortgage Solutions, Inc. [Member]	Jun. 30, 2013 Security One Lending [Member]	Jun. 30, 2013 ResCap Acquisition [Member]	Jun. 30, 2013 Ally Bank Net Assets [Member]	Jun. 30, 2013 MetLife Bank Net Assets [Member]	Jun. 30, 2013 Bank of America Asset Purchase [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of accounts serviced				1,000,000	2,000,000
Effective date of acquisition									Nov. 01, 2012		Dec. 31, 2012	Jan. 31, 2013	Mar. 01, 2013	Mar. 01, 2013	Jan. 31, 2013
Percentage of outstanding ownership interests acquired										100.00%
Impact of error correction						$ (3.7)	$ 1.5	$ (0.1)
Decrease in servicing revenue and fees and depreciation and amortization		13.2	26.1
Increase in servicing right	412.4			17.4
Decrease in intangible assets	412.4			(17.4)
Amortization of intangible assets	$ 14.1