Basic and Diluted Earnings (Loss) Per Common Share - Additional Information (Detail) (USD $)				3 Months Ended		6 Months Ended
	Jun. 30, 2014 Class A Common Stock	Dec. 31, 2013 Class A Common Stock	Jun. 30, 2013 Class A Common Stock	Jun. 30, 2014 Restricted Stock	Jun. 30, 2013 Restricted Stock	Jun. 30, 2014 Restricted Stock	Jun. 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				90,417	0	99,584	0