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Basic and Diluted Earnings Per Common Share - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Class A Common 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
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive unvested restricted stock, shares	20,437	3,354	122,323

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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