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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Commitments And Contingencies Disclosure [Abstract] |  |
Company’s contractual obligations | $ 0 |
Indemnity liability | 8,600 | $ 8,100
Total liability settlement and related to administrative fees | 6,300 | 6,300
Total insurance recoverable asset | $ 2,200 | $ 2,200

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- Definition Indemnity Liabilities + References No definition available. + Details
Name: | fa_IndemnityLiability
Namespace Prefix: | fa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total insurance recoverable asset + References No definition available. + Details
Name: | fa_TotalInsuranceRecoverableAsset
Namespace Prefix: | fa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total lability settlement and related to administrative fees + References No definition available. + Details
Name: | fa_TotalLabilitySettlementAndRelatedToAdministrativeFees
Namespace Prefix: | fa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant