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Basic and Diluted Earnings (Loss) Per Common Share - Additional Information (Detail) (USD $)				3 Months Ended	9 Months Ended
	Sep. 30, 2014 Class A Common Stock	Dec. 31, 2013 Class A Common Stock	Sep. 30, 2013 Class A Common Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2013 Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, par value (usd per share)	$ 0.01	$ 0.01	$ 0.01
Anti-dilutive unvested restricted stock, shares				0	0

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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