Noncontrolling Interest - Holders of Convertible Limited Partnership Units in Operating Partnership - Additional Information (Detail) (Noncontrolling Interest)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	25.60%
Limited partnership units	7,100,000
Limited partnership units, conversion ratio	1
Outstanding stock percent that should be acquired for rights to be exercised	39.90%
Limited partnership units convertible in to shares of common stock, eligible for conversion	887,000
Fully converted partnership units and diluted weighted average shares outstanding	27,700,000	27,100,000