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v3.24.1.u1

Segment Information (Narrative) (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2024 State
Segment Reporting Information [Line Items] |
Number of states issues title insurance policies | 49
Number of states issues home warranty contracts | 36

X
- Definition Number of states that issue home warranty contracts. + References No definition available. + Details
Name: | faf_NumberOfStatesThatIssueHomeWarrantyContracts
Namespace Prefix: | faf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of states that permit issuance of title insurance policies. + References No definition available. + Details
Name: | faf_NumberOfStatesThatPermitIssuanceOfTitleInsurancePolicies
Namespace Prefix: | faf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration