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Stock-Based Awards - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 20, 2016 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) Employee shares | Dec. 31, 2016 shares
Share-based Payment Award |  |  |  |  |
Stock option issuance period |  | 10 years |  |  |
Option vested period |  | 1 year |  |  |
Shares of common stock authorized to issue under equity award plan | shares | 10,000,000 |  |  |  |
Stock-based compensation expense |  | $ 11,590 | $ 13,255 | $ 14,717 |
Tax benefit realized for the tax deductions for share-based compensation |  | 1,649 | 2,364 | 7,684 |
Stock-based compensation expense as a result of modification to accelerate vesting of certain awards |  |  |  | $ 525 |
Number of employees to which modification to accelerate vesting of certain awards was made | Employee |  |  |  | 20 |
Total intrinsic value of options exercised |  | 301 | 4,218 | $ 1,643 |
Cash received from option exercise |  | $ 160 | $ 191 | $ 532 |
Outstanding options | shares |  | 485,536 | 570,537 | 1,158,828 | 1,368,247
Options remaining average contractual term |  | 10 months 24 days |  |  |
Options intrinsic value |  | $ 297 |  |  |
Below 25th Percentile [Member] |  |  |  |  |
Share-based Payment Award |  |  |  |  |
Shares granted and outstanding, Vesting percentage |  | 0.00% |  |  |
At 25th Percentile [Member] |  |  |  |  |
Share-based Payment Award |  |  |  |  |
Shares granted and outstanding, Vesting percentage |  | 50.00% |  |  |
At 50th Percentile [Member] |  |  |  |  |
Share-based Payment Award |  |  |  |  |
Shares granted and outstanding, Vesting percentage |  | 100.00% |  |  |
At 100th Percentile [Member] |  |  |  |  |
Share-based Payment Award |  |  |  |  |
Shares granted and outstanding, Vesting percentage |  | 200.00% |  |  |
Income Tax Expense Benefit [Member] |  |  |  |  |
Share-based Payment Award |  |  |  |  |
Tax benefit realized for the tax deductions for share-based compensation |  | $ 2,791 | $ 3,015 | $ 5,402 |
Performance Based Restricted Stock Unit [Member] | Maximum [Member] |  |  |  |  |
Share-based Payment Award |  |  |  |  |
Shares granted and outstanding, Vesting percentage |  | 200.00% |  |  |
Performance Based Restricted Stock Unit [Member] | Minimum [Member] |  |  |  |  |
Share-based Payment Award |  |  |  |  |
Shares granted and outstanding, Vesting percentage |  | 0.00% |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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