Schedule of Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Balance at Beginning of Year	$ 32,618	[1]	$ 23,926	[1]	$ 4,339	[1]
Additions charged against operations	4,540	[1],[2]	8,692	[1],[2]	22,245	[1],[3]
Net recoveries	(2,389)	[1]			(2,658)	[1]
Balance at end of year	$ 34,769	[1]	$ 32,618	[1]	$ 23,926	[1]

[1] Includes allowance for doubtful accounts, straight-line rent reserves, allowance for loan losses, tax valuation allowances and other reserves.

[2] Includes $3.7 million and $2.9 million in rent and interest reserves, respectively, related to our Denham Springs and Monroe properties and $2.1 million to fully reserve for the net deferred tax asset of one of our taxable REIT subsidiaries.

[3] Includes $12 million loan loss reserve related to our Monroe property and a $6.5 million increase in valuation allowances to fully reserve for the net deferred tax asset of one of our taxable REIT subsidiaries.