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Common Stock and Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of purchase rights granted under 2002 employee stock purchase plan | 0 | 0 |
2011 Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options and stock appreciation rights granted under stock incentive plans vesting rate, year one | 25.00% |  | 25.00%
Remaining shares vesting period |  |  | 36 months
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vesting period |  |  | 4 years
Stock Appreciation Rights (SARs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted percentage | 400.00% |  | 400.00%
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 14,342 |  | $ 14,342
Unrecognized compensation expense, weighted-average period of recognition |  |  | 1 year 7 months 6 days
Employees and non-employees award vesting, description |  |  | RSUs granted to employees generally vest in three equal annual installments starting on the first anniversary of the grant date. RSUs granted to non-employee directors generally vest in full on the first anniversary of the grant date.
Stock Options, SARs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 308 |  | $ 308
Unrecognized compensation expense, weighted-average period of recognition |  |  | 1 year 2 months 12 days
Non Employee Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted under stock incentive plan vesting rate, each anniversary | 25.00% |  | 25.00%
Employee | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vesting period |  |  | 3 years
Non-Employee | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vesting period |  |  | 1 year

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