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Stock-based Compensation - Additional Information Regarding Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Standard Stock Options | $2.70 - $3.72  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 2.70
Exercise price range, upper range limit $ 3.72
Number Outstanding (in shares) | shares 17,938
Weighted Average Remaining Contractual Life (Years) 3 years 2 months 8 days
Weighted Average Exercise Price (in dollars per share) $ 2.75
Number Exercisable (in shares) | shares 17,938
Weighted Average Exercise Price (in dollars per share) $ 2.75
Standard Stock Options | 3.85 - 3.85  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 3.85
Exercise price range, upper range limit $ 3.85
Number Outstanding (in shares) | shares 600,000
Weighted Average Remaining Contractual Life (Years) 3 years 10 months 13 days
Weighted Average Exercise Price (in dollars per share) $ 3.85
Number Exercisable (in shares) | shares 600,000
Weighted Average Exercise Price (in dollars per share) $ 3.85
Standard Stock Options | 4.24 - 6.12  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 4.24
Exercise price range, upper range limit $ 6.12
Number Outstanding (in shares) | shares 493,241
Weighted Average Remaining Contractual Life (Years) 2 years 11 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 5.94
Number Exercisable (in shares) | shares 464,786
Weighted Average Exercise Price (in dollars per share) $ 5.93
Standard Stock Options | 6.23 - 8.09  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 6.23
Exercise price range, upper range limit $ 8.09
Number Outstanding (in shares) | shares 410,349
Weighted Average Remaining Contractual Life (Years) 5 years 4 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 7.52
Number Exercisable (in shares) | shares 167,009
Weighted Average Exercise Price (in dollars per share) $ 6.85
Standard Stock Options | 8.18 - 9.19  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 8.18
Exercise price range, upper range limit $ 9.19
Number Outstanding (in shares) | shares 440,433
Weighted Average Remaining Contractual Life (Years) 4 years 4 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 8.90
Number Exercisable (in shares) | shares 236,822
Weighted Average Exercise Price (in dollars per share) $ 8.85
Standard Stock Options | 9.20 - 9.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 9.2
Exercise price range, upper range limit $ 9.2
Number Outstanding (in shares) | shares 44,300
Weighted Average Remaining Contractual Life (Years) 2 years 6 months 14 days
Weighted Average Exercise Price (in dollars per share) $ 9.20
Number Exercisable (in shares) | shares 44,300
Weighted Average Exercise Price (in dollars per share) $ 9.20
Standard Stock Options | 9.53 - 9.53  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 9.53
Exercise price range, upper range limit $ 9.53
Number Outstanding (in shares) | shares 810,000
Weighted Average Remaining Contractual Life (Years) 4 years 2 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 9.53
Number Exercisable (in shares) | shares 384,374
Weighted Average Exercise Price (in dollars per share) $ 9.53
Standard Stock Options | 9.65 - 12.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 9.65
Exercise price range, upper range limit $ 12.2
Number Outstanding (in shares) | shares 392,427
Weighted Average Remaining Contractual Life (Years) 5 years 5 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 11.50
Number Exercisable (in shares) | shares 138,690
Weighted Average Exercise Price (in dollars per share) $ 11.49
Standard Stock Options | 12.22 - 15.12  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 12.22
Exercise price range, upper range limit $ 15.12
Number Outstanding (in shares) | shares 287,845
Weighted Average Remaining Contractual Life (Years) 5 years 29 days
Weighted Average Exercise Price (in dollars per share) $ 13.16
Number Exercisable (in shares) | shares 98,825
Weighted Average Exercise Price (in dollars per share) $ 14.32
Standard Stock Options | 16.57 - 16.57  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 16.57
Exercise price range, upper range limit $ 16.57
Number Outstanding (in shares) | shares 100,000
Weighted Average Remaining Contractual Life (Years) 1 year 8 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 16.57
Number Exercisable (in shares) | shares 100,000
Weighted Average Exercise Price (in dollars per share) $ 16.57
Standard Stock Options | $2.70 - $16.57  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 2.70
Exercise price range, upper range limit $ 16.57
Number Outstanding (in shares) | shares 3,596,533
Weighted Average Remaining Contractual Life (Years) 4 years 2 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 8.45
Number Exercisable (in shares) | shares 2,252,744
Weighted Average Exercise Price (in dollars per share) $ 7.59
Market Condition Based Stock Options | $8.09 - $11.94  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 8.09
Exercise price range, upper range limit $ 11.94
Number Outstanding (in shares) | shares 200,000
Weighted Average Remaining Contractual Life (Years) 5 years 11 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 9.05
Number Exercisable (in shares) | shares 0
Weighted Average Exercise Price (in dollars per share) $ 0.00