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Segment Information (Narrative) (Detail)	9 Months Ended
	Sep. 30, 2025 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