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Stock-Based Compensation - Schedule of Information Regarding Standard and Market Condition Based Stock Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Standard stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares) 3,421,121 3,596,533 3,486,157 3,227,167
Options vested and expected to vest using estimated forfeiture rates (in shares) 3,223,919 3,452,487 3,319,308  
Options exercisable (in shares) 2,131,268 2,252,744 2,023,024  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.44 $ 8.45 $ 8.30 $ 7.78
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price (in dollars per share) 8.43 8.36 8.21  
Options exercisable, Weighted Average Exercise Price (in dollars per share) $ 8.22 $ 7.59 $ 7.18  
Options outstanding, Weighted Average Remaining Contractual Life (years) 3 years 11 months 26 days 4 years 2 months 23 days 4 years 10 months 6 days  
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years) 3 years 10 months 13 days 4 years 1 month 27 days 4 years 9 months 18 days  
Options exercisable, Weighted Average Remaining Contractual Life (years) 3 years 1 month 6 days 3 years 6 months 21 days 4 years 3 months 4 days  
Options outstanding, Aggregate Intrinsic Value $ 9.0 $ 12.5 $ 6.6  
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value 8.5 12.3 6.6  
Options exercisable, Aggregate Intrinsic Value $ 6.4 $ 9.9 $ 6.0  
Market condition based stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares) 225,000 200,000 50,000 0
Options vested and expected to vest using estimated forfeiture rates (in shares) 209,141 184,125 45,430  
Options exercisable (in shares) 65,625 0 0  
Options outstanding, weighted average exercise price (in dollars per share) $ 8.39 $ 9.05 $ 11.94 $ 0.00
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price (in dollars per share) 8.38 9.12 11.94  
Options exercisable, Weighted Average Exercise Price (in dollars per share) $ 8.09 $ 0.00 $ 0.00  
Options outstanding, Weighted Average Remaining Contractual Life (years) 5 years 6 months 5 years 11 months 1 day 6 years 1 month 24 days  
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years) 5 years 5 months 26 days 5 years 10 months 24 days 6 years 1 month 24 days  
Options exercisable, Weighted Average Remaining Contractual Life (years) 5 years 2 months 1 day 0 years 0 years  
Options outstanding, Aggregate Intrinsic Value $ 0.5 $ 0.5 $ 0.0  
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value 0.5 0.5 0.0  
Options exercisable, Aggregate Intrinsic Value $ 0.2 $ 0.0 $ 0.0  
$8.09 - $8.09 | Market condition based stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding (in shares) 150,000      
Weighted Average Remaining Contractual Life (Years) 5 years 2 months 1 day      
Weighted Average Exercise Price (in dollars per share) $ 8.09      
Number Exercisable (in shares) 65,625      
Weighted Average Exercise Price (in dollars per share) $ 8.09      
9.00 - 9.00 | Market condition based stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding (in shares) 75,000      
Weighted Average Remaining Contractual Life (Years) 6 years 1 month 27 days      
Weighted Average Exercise Price (in dollars per share) $ 9.00      
Number Exercisable (in shares) 0      
Weighted Average Exercise Price (in dollars per share) $ 0.00      
$8.09 - $9.00 | Market condition based stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number Outstanding (in shares) 225,000      
Weighted Average Remaining Contractual Life (Years) 5 years 6 months      
Weighted Average Exercise Price (in dollars per share) $ 8.39      
Number Exercisable (in shares) 65,625      
Weighted Average Exercise Price (in dollars per share) $ 8.09