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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Insurance [Abstract] |  |  |  |
Provision for title loss, percentage of title premiums and escrow fees | 3.00% | 3.00% | 3.00% | 3.33%
Ultimate loss rate |  |  | 3.75% | 3.75%
Percentage reserve releases for prior policy years | 0.75% | 0.75% | 0.75% | 0.42%
Reserve releases for prior policy years | $ 9.1 | $ 8.6 | $ 25.0 | $ 14.0

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- 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

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- 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

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