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Stock-based Compensation - Additional Information Regarding Options Outstanding (Detail) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Standard stock options | $3.72 - $3.72 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | $ 3.72
Exercise price range, upper range limit | $ 3.72
Number Outstanding (in shares) | shares | 938
Weighted Average Remaining Contractual Life (Years) | 1 year 6 months 14 days
Weighted Average Exercise Price (in dollars per share) | $ 3.72
Number Exercisable (in shares) | shares | 938
Weighted Average Exercise Price (in dollars per share) | $ 3.72
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) | 1 year 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 | 4.95 - 6.66 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 4.95
Exercise price range, upper range limit | $ 6.66
Number Outstanding (in shares) | shares | 374,068
Weighted Average Remaining Contractual Life (Years) | 4 years 1 month 17 days
Weighted Average Exercise Price (in dollars per share) | $ 6.34
Number Exercisable (in shares) | shares | 263,312
Weighted Average Exercise Price (in dollars per share) | $ 6.23
Standard stock options | 6.86 - 8.09 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 6.86
Exercise price range, upper range limit | $ 8.09
Number Outstanding (in shares) | shares | 405,525
Weighted Average Remaining Contractual Life (Years) | 4 years 7 months 27 days
Weighted Average Exercise Price (in dollars per share) | $ 7.82
Number Exercisable (in shares) | shares | 206,030
Weighted Average Exercise Price (in dollars per share) | $ 7.83
Standard stock options | 8.13 - 8.65 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 8.13
Exercise price range, upper range limit | $ 8.65
Number Outstanding (in shares) | shares | 386,949
Weighted Average Remaining Contractual Life (Years) | 4 years
Weighted Average Exercise Price (in dollars per share) | $ 8.54
Number Exercisable (in shares) | shares | 196,434
Weighted Average Exercise Price (in dollars per share) | $ 8.56
Standard stock options | 8.70 - 9.19 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 8.70
Exercise price range, upper range limit | $ 9.19
Number Outstanding (in shares) | shares | 378,506
Weighted Average Remaining Contractual Life (Years) | 2 years 6 months 3 days
Weighted Average Exercise Price (in dollars per share) | $ 9.04
Number Exercisable (in shares) | shares | 279,659
Weighted Average Exercise Price (in dollars per share) | $ 9.10
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 | 9.20
Exercise price range, upper range limit | $ 9.20
Number Outstanding (in shares) | shares | 44,300
Weighted Average Remaining Contractual Life (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 | 734,000
Weighted Average Remaining Contractual Life (Years) | 1 year 11 months 19 days
Weighted Average Exercise Price (in dollars per share) | $ 9.53
Number Exercisable (in shares) | shares | 734,000
Weighted Average Exercise Price (in dollars per share) | $ 9.53
Standard stock options | 9.61 - 12.48 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 9.61
Exercise price range, upper range limit | $ 12.48
Number Outstanding (in shares) | shares | 336,414
Weighted Average Remaining Contractual Life (Years) | 2 years 7 months 20 days
Weighted Average Exercise Price (in dollars per share) | $ 11.82
Number Exercisable (in shares) | shares | 292,026
Weighted Average Exercise Price (in dollars per share) | $ 11.92
Standard stock options | 12.49 - 14.02 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 12.49
Exercise price range, upper range limit | $ 14.02
Number Outstanding (in shares) | shares | 17,291
Weighted Average Remaining Contractual Life (Years) | 1 year 7 days
Weighted Average Exercise Price (in dollars per share) | $ 13.74
Number Exercisable (in shares) | shares | 17,291
Weighted Average Exercise Price (in dollars per share) | $ 13.74
Standard stock options | $3.72 - $14.02 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 3.72
Exercise price range, upper range limit | $ 14.02
Number Outstanding (in shares) | shares | 3,277,991
Weighted Average Remaining Contractual Life (Years) | 2 years 10 months 17 days
Weighted Average Exercise Price (in dollars per share) | $ 7.99
Number Exercisable (in shares) | shares | 2,633,990
Weighted Average Exercise Price (in dollars per share) | $ 7.94
Standard stock options | $8.09 - $8.09 |
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 | 8.09
Standard stock options | 8.65 - 8.65 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 8.65
Exercise price range, upper range limit | $ 8.65
Market condition based stock options | $8.09 - $8.09 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number Outstanding (in shares) | shares | 135,000
Weighted Average Remaining Contractual Life (Years) | 1 year 10 months 27 days
Weighted Average Exercise Price (in dollars per share) | $ 8.09
Number Exercisable (in shares) | shares | 135,000
Weighted Average Exercise Price (in dollars per share) | $ 8.09
Market condition based stock options | 8.65 - 8.65 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number Outstanding (in shares) | shares | 84,581
Weighted Average Remaining Contractual Life (Years) | 1 year 10 months 27 days
Weighted Average Exercise Price (in dollars per share) | $ 8.65
Number Exercisable (in shares) | shares | 84,581
Weighted Average Exercise Price (in dollars per share) | $ 8.65
Market condition based stock options | 9.00 - 9.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit | 9.00
Exercise price range, upper range limit | $ 9.00
Number Outstanding (in shares) | shares | 52,500
Weighted Average Remaining Contractual Life (Years) | 1 year 10 months 27 days
Weighted Average Exercise Price (in dollars per share) | $ 9.00
Number Exercisable (in shares) | shares | 52,500
Weighted Average Exercise Price (in dollars per share) | $ 9.00
Market condition based stock options | $8.09 - $9.00 |
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 | $ 9.00
Number Outstanding (in shares) | shares | 272,081
Weighted Average Remaining Contractual Life (Years) | 1 year 10 months 27 days
Weighted Average Exercise Price (in dollars per share) | $ 8.44
Number Exercisable (in shares) | shares | 272,081
Weighted Average Exercise Price (in dollars per share) | $ 8.44

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