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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Insurance [Abstract] |  |
Provision for title loss, percentage of title premiums and escrow fees | 3.50% | 4.00%
Ultimate loss rate | 3.75% |
Estimated percentage decrease in loss reserve for prior policy years | 0.25% |
Estimated decrease in loss reserve for prior policy years | $ 2.5 |
Estimated increase in loss reserve for prior policy years |  | $ 0.0

X
- Definition Decrease in loss reserve estimates for prior policy years. + References No definition available. + Details
Name: | faf_DecreaseInLossReserveEstimatesForPriorPolicyYears
Namespace Prefix: | faf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Percentage decrease in loss reserve estimates for prior policy years. + References No definition available. + Details
Name: | faf_PercentageDecreaseInLossReserveEstimatesForPriorPolicyYears
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