Stockholders' Equity of the REIT and Partners' Capital of the Operating Partnership - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Series Q Preferred Stock [Member]	Sep. 30, 2014 Series Q Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation Preference Per share	$ 50		$ 50		$ 50
Preferred Stock Par Value	$ 0.01		$ 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
Redemption Premium of Preferred Stock	$ 6,517	$ 9,108		$ 6,500