Activity in Allowance for Losses for Non-Covered Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Valuation Allowance [Line Items]
Balance, beginning of period			$ 140,948	$ 137,290
Charge-offs			(13,043)	(31,795)
Recoveries			2,784	2,419
Provision for losses on non-covered loans	9,618	33,448	19,120	48,448
Balance, end of period	140,689	137,914	140,689	137,914
Non-Covered Loans
Valuation Allowance [Line Items]
Provision for losses on non-covered loans	5,000	15,000	10,000	30,000
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period			127,934	121,995
Charge-offs			(6,024)	(28,982)
Recoveries			2,306	442
Balance, end of period	123,915	124,294	123,915	124,294
Mortgage Receivable | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for losses on non-covered loans			(301)	30,839
Other loan
Valuation Allowance [Line Items]
Balance, beginning of period			13,014	15,295
Charge-offs			(7,019)	(2,813)
Recoveries			478	1,977
Balance, end of period	16,774	13,620	16,774	13,620
Other loan | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for losses on non-covered loans			$ 10,301	$ (839)