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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Insurance [Abstract]
Provision for title loss, percentage of title premiums and escrow fees	4.00%	4.00%	4.00%	4.00%
Ultimate loss rate	4.00%	4.00%	4.00%	4.00%
Estimated increase in loss reserve for prior policy years			$ 0

X

- Definition

Increase in loss reserve estimates for prior policy years.

+ References

No definition available.

+ Details

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

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

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