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Earnings per Share of Common Stock - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Weighted average number of OP units held by the non-controlling interest	342,648	461,614
Unvested shares of restricted common stock	964,820	598,815

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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