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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Numerator:          
Net income (loss) attributable to common stockholders $ 1,025 $ (6,655) $ (8,247) $ (20,078)  
Number of shares outstanding, end of period:          
Unvested restricted stock (156,000) (126,000) (156,000) (126,000)  
Effect of weighted average shares outstanding during period (312,000) (317,000) (327,000) (360,000)  
Weighted average number of common shares used in basic EPS 40,447,000 39,995,000 40,432,000 39,952,000  
Impact of potentially dilutive securities:          
Dilutive effect of options and restricted stock units 399,000        
Weighted average number of common shares used in diluted EPS 40,846,000 39,995,000 40,432,000 39,952,000  
Antidilutive potentially issuable shares not included in the diluted EPS calculations 793,000 2,003,000 2,271,000 2,003,000  
Class A Common Stock [Member]          
Number of shares outstanding, end of period:          
Common stock shares outstanding 39,927,000 39,450,000 39,927,000 39,450,000 39,587,000
Class B Common Stock [Member]          
Number of shares outstanding, end of period:          
Common stock shares outstanding 988,000 988,000 988,000 988,000 988,000