Activity in Allowance for Losses for Non-Covered Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Valuation Allowance [Line Items]
Balance, beginning of period			$ 140,948	$ 137,290
Charge-offs			(19,755)	(41,759)
Recoveries			5,121	3,484
Provision for losses on non-covered loans	14,467	12,820	33,587	61,268
Balance, end of period	141,314	139,015	141,314	139,015
Non-Covered Loans
Valuation Allowance [Line Items]
Provision for losses on non-covered loans	5,000	10,000	15,000	40,000
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period			127,934	121,995
Charge-offs			(12,716)	(35,542)
Recoveries			3,580	735
Balance, end of period	125,649	125,694	125,649	125,694
Mortgage Receivable | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for losses on non-covered loans			6,851	38,506
Other loan
Valuation Allowance [Line Items]
Balance, beginning of period			13,014	15,295
Charge-offs			(7,039)	(6,217)
Recoveries			1,541	2,749
Balance, end of period	15,665	13,321	15,665	13,321
Other loan | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for losses on non-covered loans			$ 8,149	$ 1,494