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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 24, 2016 | May 22, 2007 | Sep. 30, 2020 | Sep. 30, 2019 | May 12, 2020 | May 15, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock authorized to be issued under plan (in shares) | 8,900,000 |  |  |  |  |
Unrecognized pre-tax compensation cost |  |  | $ 23,400 |  |  |
Weighted average recognition period (in years) |  |  | 3 years 1 month 6 days |  |  |
Total intrinsic value of options exercised during period |  |  | $ 12,100 | $ 7,000 |  |
Cash received from options exercised during period |  |  | $ 18,519 | $ 11,283 |  |
Award requisite service period |  |  | 1 year |  |  |
2007 Long-Term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock authorized to be issued under plan (in shares) | 400,000 | 3,300,000 |  |  |  |
Award vesting period |  | 5 years |  |  |  |
Exercise price of shares granted may not be less than fair market value (percentage) |  | 100.00% |  |  |  |
Unrecognized pre-tax compensation cost |  |  | $ 5,300 |  |  |
Weighted average recognition period (in years) |  |  | 2 years 10 months 24 days |  |  |
2016 Long-Term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock authorized to be issued under plan (in shares) | 3,400,000 |  |  |  | 2,500,000 | 2,600,000
Exercise price of shares granted may not be less than fair market value (percentage) | 100.00% |  |  |  |  |
Director | Options Granted on or after May 25, 2004 | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Annual vesting period |  |  | 33.33% |  |  |

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- Definition The exercise price of granted shares may not be below this percentage of fair market value under the terms of the stock option plans. + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 Number of shares authorized for issuance 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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