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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Insurance [Abstract]
Provision for title loss, percentage of title premiums and escrow fees	3.00%	3.00%
Ultimate loss rate	3.75%	3.75%
Percentage reserve releases for prior policy years	0.75%	0.75%
Reserve releases for prior policy years	$ 8.4	$ 7.3

X

- Definition

The provision for title losses expressed as a percentage of title premiums and escrow fees.

+ References

No definition available.

+ Details

Name:	faf_LossProvisionPercentageOfTitlePremiumsAndEscrowFees
Namespace Prefix:	faf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage reserve releases for prior policy years.

+ References

No definition available.

+ Details

Name:	faf_PercentageReserveReleasesForPriorPolicyYears
Namespace Prefix:	faf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reserve releases for prior policy years.

+ References

No definition available.

+ Details

Name:	faf_ReserveReleasesForPriorPolicyYears
Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Ultimate loss rate percentage.

+ References

No definition available.

+ Details

Name:	faf_UltimateLossRatePercentage
Namespace Prefix:	faf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration