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Stockholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Aug. 05, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from exercise of stock options     $ 31,402,000 $ 894,000  
Income tax benefit realized from stock option exercises during period     0 0  
Total compensation cost     $ 5,213,000 $ 4,438,000  
Amount share repurchase program of common shares         $ 25,000,000
Share Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares purchased and retired     0 423  
Average price of common stock   $ 6.29   $ 6.29  
Total cost of common stock purchased and retired       $ 2,660,000  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from exercise of stock options     $ 31,402,000 894,000  
Total compensation cost $ 547,000 $ 646,000 1,554,000 2,033,000  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost 667,000 736,000 $ 2,022,000 $ 2,137,000  
Vesting of restricted shares and exercise of stock options, withholding and exercise obligations     122,000 117,000  
Restricted shares of common stock and stock options, aggregate values     $ 1,234,000 $ 651,000  
Performance Based Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Performance Based Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Performance Based Restricted Stock Unit [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost $ 368,000 $ 114,000 $ 1,637,000 $ 268,000