Stockholders' Equity of the REIT and Partners' Capital of the Operating Partnership - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Class of Stock [Line Items]
Liquidation Preference Per share	$ 50	$ 50		$ 50
Preferred Stock Par Value	$ 0.01	$ 0.01		$ 0.01
Redemption Premium of Preferred Stock	$ 6,517	$ 6,517	$ 9,108
Series Q Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation Preference Per share	$ 50	$ 50
Preferred Stock Par Value	$ 0.01	$ 0.01
Preferred stock dividend rate percentage		8.54%
Preferred Stock redemption date		Nov. 13, 2026
Repurchase of preferred stock, shares	435,300	435,300
Redemption Premium of Preferred Stock		$ 6,500