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Share-Based Compensation - Summary of the Option Unit Activity (Details) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
2021 Equity Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of units, grant outstanding beginning balance | 0 |
Number of units, exchange for options in the company | 3,222,790 |
Number of units, grant outstanding ending balance | 3,222,790 | 3,222,790
Number of units, vested | 343,926 | 343,926
Number of units, unvested | 2,878,864 | 2,878,864
Weighted average exercise price, grant outstanding beginning balance | $ 0 |
Weighted average exercise price, issued in exchange for options in the company's parent | 15.00 |
Weighted average exercise price, grant outstanding ending balance | 15.00 | $ 15.00
Weighted average exercise price, grants vested | 15.00 | 15.00
Weighted average exercise price, grants unvested | $ 15.00 | $ 15.00
First Advantage Corporation [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of units, grant outstanding beginning balance |  | 0
Number of units, exercised |  | (28,262)
Number of units, forfeited |  | (283,816)
Number of units, exchange for options in the company |  | 3,938,491
Number of units, grant outstanding ending balance | 3,626,413 | 3,626,413
Number of units, vested | 349,018 | 349,018
Number of units, unvested | 3,277,395 | 3,277,395
Weighted average exercise price, grant outstanding beginning balance |  | $ 0
Weighted average exercise price, issued in exchange for options in the company's parent |  | 6.65
Weighted average exercise price, exercised |  | 6.61
Weighted average exercise price, forefeited |  | 6.61
Weighted average exercise price, grant outstanding ending balance | $ 6.63 | 6.63
Weighted average exercise price, grants vested | 6.61 | 6.61
Weighted average exercise price, grants unvested | $ 6.63 | $ 6.63
Fastball Holdco L P [Member] | Class B Awards [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of units, grant outstanding beginning balance |  | 2,733,734
Number of units, exercised |  | (24,112)
Number of units, forfeited |  | (107,168)
Number of units, exchange for options in the company |  | (2,602,454)
Number of units, grant outstanding ending balance | 0 | 0
Weighted average exercise price, grant outstanding beginning balance |  | $ 10.06
Weighted average exercise price, exercised |  | 10.00
Weighted average exercise price, forefeited |  | 10.00
Weighted average exercise price, exchanged for options |  | $ 10.07

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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