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Stock-Based Awards - Additional Information (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2002 | Jun. 20, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 |  | 10,000,000 |  |  |  |
Stock-based compensation expense |  |  | $ 11,706 | $ 11,590 | $ 13,255 |
Tax benefit realized for the tax deductions for share-based compensation |  |  | 833 | 1,649 | 2,364 |
Total intrinsic value of options exercised |  |  | 168 | 301 | 4,218 |
Cash received from option exercise |  |  | $ 292 | $ 160 | $ 191 |
Outstanding options | 305,000 |  | 305,000 | 485,536 | 570,537 | 1,158,828
Options remaining average contractual term | 3 months 18 days |  | 3 months 18 days |  |  |
Options intrinsic value | $ 57 |  |  |  |  |
Aggregate fair value of awards that vested |  |  | $ 4,783 | $ 6,720 | $ 5,975 |
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 |  |  | $ 2,739 | $ 2,791 | $ 3,015 |
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 Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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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=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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