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Earnings Per Share - Summary of Numerator and Denominators Used in Computation of Earnings Per Share (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Numerator:          
Net income (loss) attributable to common stockholders $ 5,195 $ 1,025 $ (2,413) $ (8,247)  
Number of shares outstanding, end of period:          
Unvested restricted stock (115,000) (156,000) (115,000) (156,000)  
Effect of weighted average shares outstanding (241,000) (312,000) (309,000) (327,000)  
Basic weighted average common shares outstanding 41,132,000 40,447,000 41,064,000 40,432,000  
Impact of potentially dilutive securities:          
Dilutive effect of options and restricted / performance stock units 466,000 399,000      
Diluted weighted average common shares outstanding 41,598,000 40,846,000 41,064,000 40,432,000  
Antidilutive potentially issuable shares 473,000 793,000 2,211,000 2,271,000  
Class A Common Stock [Member]          
Number of shares outstanding, end of period:          
Common stock shares outstanding 40,500,000 39,927,000 40,500,000 39,927,000 40,064,000
Class B Common Stock [Member]          
Number of shares outstanding, end of period:          
Common stock shares outstanding 988,000 988,000 988,000 988,000 988,000