Notes Payable - Additional Information (Detail) (USD $)						3 Months Ended											3 Months Ended			3 Months Ended					3 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Interest Rate Forward Swap [Member] Contract	Oct. 16, 2013 Interest Rate Forward Swap [Member]	Mar. 31, 2014 Unsecured Debt [Member]	Mar. 31, 2014 Unsecured Debt [Member] Senior Guaranteed Notes	Oct. 16, 2013 Unsecured Debt [Member] Senior Guaranteed Notes	Aug. 07, 2013 Unsecured Debt [Member] $500 million unsecured revolving credit faciltiy [Member] [Member]	Mar. 31, 2014 Unsecured Debt [Member] Variable Rate Debt	Mar. 31, 2014 Secured Debt [Member]	Mar. 31, 2014 Secured Debt [Member] Fixed Rate Debt	Mar. 31, 2014 Secured Debt [Member] Variable Rate Debt	Mar. 31, 2014 Unsecured Debt [Member]	Dec. 13, 2013 Colonial [Member] Unsecured Debt [Member] 6.25% Senior Notes due 2014 [Domain]	Dec. 13, 2013 Colonial [Member] Unsecured Debt [Member] 5.5% Senior Notes due 2015 [Domain]	Dec. 13, 2013 Colonial [Member] Unsecured Debt [Member] 6.05% Senior Notes due 2016 [Domain]	Mar. 31, 2014 Limited Partner [Member]	Mar. 31, 2013 Limited Partner [Member]	Dec. 13, 2013 Limited Partner [Member]	Mar. 31, 2014 Limited Partner [Member] Unsecured Debt [Member] Exchange Notes [Domain]	Dec. 13, 2013 Limited Partner [Member] Unsecured Debt [Member] 6.25% Senior Notes due 2014 [Domain]	Dec. 13, 2013 Limited Partner [Member] Unsecured Debt [Member] 5.5% Senior Notes due 2015 [Domain]	Dec. 13, 2013 Limited Partner [Member] Unsecured Debt [Member] 6.05% Senior Notes due 2016 [Domain]	Oct. 16, 2013 Minimum [Member] Unsecured Debt [Member] Senior Guaranteed Notes	Mar. 31, 2014 Minimum [Member] Unsecured Debt [Member] $500 million unsecured revolving credit faciltiy [Member] [Member]	Oct. 16, 2013 Maximum [Member] Unsecured Debt [Member] Senior Guaranteed Notes	Mar. 31, 2014 Maximum [Member] Unsecured Debt [Member] $500 million unsecured revolving credit faciltiy [Member] [Member]	Mar. 31, 2014 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Contract	Mar. 31, 2014 Designated as Hedging Instrument [Member] Interest Rate Caps Contract	Mar. 31, 2014 Not Designated as Hedging Instrument [Member] Interest Rate Caps Contract
Debt Instrument [Line Items]
Notes Payable	$ 3,463,059,000	$ 3,470,000,000							$ 0	$ 1,785,161,000	$ 1,341,500,000	$ 443,661,000	$ 1,677,898,000
Debt Instrument, Face Amount							350,000,000	500,000,000
Debt Instrument, Interest Rate, Stated Percentage							4.30%							6.25%	5.50%	6.05%					6.25%	5.50%	6.05%
Cash Received from Notes Exchange																			975,000
Covenant Obligation, Debt to Total Asset Value							60.00%
Covenant Obligation, Secured Debt to Total Asset Value Ratio							40.00%
Covenant Obligation, Fixed Charge Ratio																								150.00%		100.00%
Covenant Obligation, Unencumbered Leverage Ratio							150.00%
Debt Instrument, Interest Rate, Additional Interest, Maximum																				0.50%
Debt Instrument, Issue Price							0.99047
Debt Instrument, Unamortized Discount							3,300,000
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions						2,300,000
Proceeds from Notes Payable						344,400,000											344,000	0
Number of Interest Rate Derivatives Held			3
Debt Instrument, Basis Spread on Variable Rate																									0.90%		1.70%
Secured credit facility as a Percentage of outstanding debt	18.00%
Derivative, Number of Instruments Held																												14	7	15
Debt Instrument, Interest Rate, Effective Percentage	3.80%			4.15%	4.30%
Aggregate Principal Amount of Notes Exchanged														154,235,000	169,161,000	68,130,000					154,235,000	169,112,000	68,130,000
Derivative, Notional Amount			$ 150,000,000																									$ 717,000,000	$ 180,000,000	$ 134,326,000