Fair Value - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent earn-out payments		$ 10,900,000
Payment made to the prior owners		5,000,000
Period For Fair Value Option Delinquency Disclosure	90 days
Real estate owned, net	88,362,000	73,573,000
Concentrations Threshold For State Concentrations Of Residential Loans	5.00%
Real Estate Owned Expense	7,000,000	6,400,000	6,800,000
Real Estate Owned, Valuation Allowance, Provision	2,800,000	800,000	2,700,000
Mortgage Loans related to Non-Residual Trusts [Member] | Loans Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans past due under fair value option	2,000,000	1,700,000
Unpaid principal balance of loans past due under fair value option	10,200,000	9,400,000
Loans and Residuals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned, net	32,100,000	45,300,000
Reverse Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned, net	55,300,000	27,000,000
Other Segments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned, net	$ 1,000,000	$ 1,300,000