Fair Value - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned, net	$ 87,624,000	$ 88,362,000
Real Estate In Process Of Foreclosure	156,500,000
Reverse Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned, net	57,300,000	55,300,000
Servicing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned, net	29,200,000	32,100,000
Other Segments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned, net	1,100,000	1,000,000
Loans Receivable [Member] | Forward Loans in Non-Residual Trusts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of days for fair value option delinquency disclosure	90 days
Fair value of loans past due under fair value option	1,800,000	2,000,000
Unpaid principal balance of loans past due under fair value option	$ 9,400,000	$ 10,200,000