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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Numerator:          
Net income (loss) attributable to common stockholders $ 2,296 $ 1,080 $ (5,951) $ (18,998)  
Number of shares outstanding, end of period:          
Unvested restricted stock (127,000) (126,000) (127,000) (126,000)  
Effect of weighted average shares outstanding during period (29,000) (1,000) (279,000) (240,000)  
Weighted average number of common shares used in basic EPS 40,810,000 40,313,000 40,560,000 40,074,000  
Impact of potentially dilutive securities:          
Dilutive effect of options and restricted stock units 473,000 268,000      
Weighted average number of common shares used in diluted EPS 41,283,000 40,581,000 40,560,000 40,074,000  
Antidilutive potentially issuable shares not included in the diluted EPS calculations 665,000 1,210,000 2,157,000 2,186,000  
Class A Common Stock [Member]          
Number of shares outstanding, end of period:          
Common stock shares outstanding 39,978,000 39,452,000 39,978,000 39,452,000 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