Roll-Forward of Allowance for Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Balance, Beginning of Period	$ 30,400	$ 46,082	$ 69,691
Provision	3,000	2,000	3,900
Charge-offs, net of recoveries	(10,445)	(17,682)	(27,509)
Balance, End of Period	$ 22,955	$ 30,400	$ 46,082