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Earnings Per Share - Schedule of Numerator and Denominator Used in Computation of Earnings Per Share (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Numerator:      
Net loss attributable to common stockholders $ (7,608) $ (9,271)  
Number of shares outstanding, end of period:      
Unvested restricted stock (115,000) (159,000)  
Effect of weighted average shares outstanding (120,000)    
Weighted average common shares outstanding 40,996,000 40,417,000  
Antidilutive potentially issuable shares 2,445,000 2,705,000  
Class A Common Stock [Member]      
Number of shares outstanding, end of period:      
Common stock shares outstanding 40,243,000 39,588,000 40,064,000
Class B Common Stock [Member]      
Number of shares outstanding, end of period:      
Common stock shares outstanding 988,000 988,000 988,000