Credit Facilities and Mortgage Notes Payable - Unsecured Credit Facility - Additional Information (Detail) (USD $) In Millions, unless otherwise specified						3 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended		3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Minimum [Member] Libor Rate [Member]	Mar. 31, 2014 Minimum [Member] Base Rate [Member]	Mar. 31, 2014 Maximum [Member] Libor Rate [Member]	Mar. 31, 2014 Maximum [Member] Base Rate [Member]	Mar. 31, 2014 Term Loan [Member]	Apr. 11, 2014 Term Loan [Member] Maximum [Member] Subsequent Event [Member]	Feb. 28, 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Letter of Credit [Member]	Mar. 31, 2014 Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility agreement date											May 01, 2013
Credit Facility maximum borrowing capacity						$ 225		$ 400	$ 350		$ 575
Unsecured Credit Facility term						5 years			4 years
Line of credit accordion feature											100
Increase the amount of line of credit facility											675
Additional letter of credit outstanding										3
Leverage Ratio		2.10%	1.10%	2.85%	1.85%
Line of credit facility weighted average interest rate outstanding percentage	2.26%
Unsecured revolving credit facility								50
Line of credit facility minimum prepayment							$ 150