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Acquisitions - Summary of Consideration Paid and Amounts Recognized for Assets Acquired and Liabilities Assumed (Details) - Sterling Check Corp [Member] - USD ($) $ in Thousands |  | 6 Months Ended
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Oct. 31, 2024 | Jun. 30, 2025
Consideration |  |
Total fair value of consideration transferred | $ 2,200,000 |
Merger Agreement [Member] |  |
Consideration |  |
Cash Consideration |  | $ 1,152,163
Plus: fair value of assumed Sterling equity awards to receive cash attributable to pre-combination service |  | 15,905
Plus: repayment of Sterling's outstanding debt |  | 535,046
Plus: fair value of First Advantage common stock issued |  | 490,098
Plus: fair value of assumed Sterling equity awards to receive equity awards attributable to pre-combination service |  | 4,487
Total fair value of consideration transferred |  | 2,197,699
Current assets |  | 226,800
Property and equipment, including software developed for internal use |  | 273,370
Intangible assets |  | 717,000
Deferred tax asset |  | 58,100
Other assets |  | 12,516
Current liabilities |  | (155,596)
Deferred tax liability |  | (238,221)
Other liabilities |  | (16,075)
Total identifiable net assets |  | 877,894
Goodwill |  | $ 1,319,805

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