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Equity-Based Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized common stock | 8,200,000 |  | 8,200,000 |
Annual increments in employee grants |  |  | 25.00% |
Equity incentive plan available for future grant | 1,067,730 |  | 1,067,730 |
Stock options, contractual term |  |  | 10 years |
Equity-based compensation expense | $ 5,471,000 | $ 4,039,000 | $ 16,258,000 | $ 14,322,000
Unrecognized compensation expense related to unvested options |  |  | $ 41,800,000 |
Vesting period |  |  | 1 year 3 months 18 days |
Warrant outstanding | 0 |  | $ 0 |
Deferred income tax benefit |  |  | 41,803,000 | 5,150,000
Stock Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Deferred income tax benefit | $ 1,400,000 | $ 1,300,000 | $ 4,300,000 | $ 4,100,000
Restricted Stock Award [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Restricted Stock Award [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 4 years |
Restricted Stock Units [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 2 years |
Number of shares issuable at the end of the vesting period, percentage |  |  | 0.00% |
Restricted Stock Units [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Number of shares issuable at the end of the vesting period, percentage |  |  | 200.00% |

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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=120381028&loc=d3e5070-113901 + Details
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