Notes Payable - Additional Information (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Fixed Rate Debt	Dec. 31, 2011 Fixed Rate Debt	Mar. 01, 2012 Unsecured Debt [Member] $150 million unsecured term loan [Domain]	Jun. 30, 2012 Interest Rate Swaps	Jun. 30, 2012 Interest Rate Caps	Jun. 30, 2012 Not Designated as Hedging Instrument [Member]	Jun. 30, 2012 Secured Debt [Member]	Jun. 30, 2012 Secured Debt [Member] Fixed Rate Debt	Jun. 30, 2012 Secured Debt [Member] Individual Property Mortgages [Member] Fixed Rate Debt	Jun. 30, 2012 Secured Debt [Member] L I B O R [Member] Fixed Rate Debt	Jun. 30, 2012 Unsecured Debt [Member]	Jun. 30, 2012 Unsecured Debt [Member] L I B O R [Member] Fixed Rate Debt		Jun. 30, 2012 Unsecured Debt [Member] Senior Guaranteed Notes Fixed Rate Debt	Jun. 30, 2012 Paddock Club Florence [Member] Secured Debt [Member] Individual Property Mortgages [Member] Fixed Rate Debt	Jun. 30, 2012 Minimum $150 million unsecured term loan [Domain]	Mar. 01, 2012 Minimum $150 million unsecured term loan [Domain]	Jun. 30, 2012 Maximum $150 million unsecured term loan [Domain]	Mar. 01, 2012 Maximum $150 million unsecured term loan [Domain]
Debt Instrument [Line Items]
Notes Payable	$ 1,589,421,000	$ 1,649,755,000	$ 569,000,000	$ 538,000,000					$ 1,226,421,000	$ 876,538,000	$ 374,738,000	$ 434,000,000	$ 363,000,000	$ 150,000,000	[1]	$ 135,000,000	$ 9,100,000
Debt Instrument, Face Amount					150,000,000
Debt Instrument, Basis Spread on Variable Rate																		110.00%	1.40%	205.00%	2.15%
Secured credit facility as a Percentage of outstanding debt	53.00%
Number of interest rate contracts						23	18
Notional						$ 601,800,000	$ 256,371,000	$ 14,280,000
Derivative, Number of Instruments Held								3
Debt Instrument, Interest Rate, Effective Percentage	3.80%								3.90%	5.00%	4.80%	5.20%	3.40%	2.70%		5.10%	5.90%

[1] 1) Includes capped balances.(2) Excludes borrowings on properties categorized as Assets Held for Sale on the Consolidated Balance Sheet. As of June 30, 2012 held for sale properties include a $9.1 million mortgage with a fixed interest rate of 5.9% maturing on January 1, 2044.