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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 shares | Dec. 31, 2018 USD ($) Offering $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Jan. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant | shares |  |  | 5,300,000 |  |  |
Stock-based compensation expense |  |  | $ 12,510 | $ 12,727 | $ 8,023 |
Unrecognized stock-based compensation expense |  |  | $ 13,600 |  |  |
Unrecognized stock-based compensation, expected to be recognized, weighted average period |  |  | 2 years 3 months 18 days |  |  |
Fair value of options vested |  |  | $ 3,700 | 4,200 | 3,400 |
Intrinsic value of options exercised |  |  | 14,900 | 2,800 | 8,600 |
Intrinsic value of options outstanding |  |  | $ 26,700 | $ 7,300 | $ 25,600 |
Weighted average fair value per share of options granted | $ / shares |  |  | $ 19.48 | $ 18.85 | $ 16.13 |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional shares reserved for issuance under the plan | shares |  |  | 1,000,000 |  |  |
Stock-based compensation expense |  |  | $ 500 | $ 700 | $ 600 |
Number of offerings per year | Offering |  |  | 2 |  |  |
Amount withheld from employees |  |  | $ 1,700 | $ 1,900 | $ 1,700 |
Employee stock purchase plan, shares purchased | shares |  |  | 34,798 | 40,968 | 33,357 |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Purchase price as a percentage of fair market value |  |  | 85.00% |  |  |
Chief Executive Officers [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 3,600 |  |
Equity Incentive Plan [Member] | 2010 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional shares reserved for issuance under the plan | shares |  | 1,024,868 |  |  |  | 1,027,620
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 3,355 | 5,223 | $ 3,777 |
Vesting period |  |  | 4 years |  |  |
Stock options exercisable | shares |  |  | 576,842 |  |  |
Weighted average exercise price | $ / shares |  |  | $ 50.10 |  |  |
Weighted average remaining contractual life |  |  | 4 years |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options contractual term range |  |  | 7 years |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options contractual term range |  |  | 10 years |  |  |
Performance Share Unit [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 3 years | 3 years |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 5,930 | 6,526 | 3,386 |
Vesting period |  |  | 4 years |  |  |
Restricted Stock Award [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 487 | $ 318 | $ 308 |
Restricted stock awards units vest over, period |  |  | 1 year |  |  |
Performance Share Units and Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of RSU's vested and not issued during the period | shares |  |  | 54,688 |  |  |

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