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v3.23.2

Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Insurance [Abstract] |  |  |  |
Provision for title loss, percentage of title premiums and escrow fees | 3.50% | 4.00% | 3.50% | 4.00%
Ultimate loss rate |  |  | 3.75% |
Estimated increase in loss reserve for prior policy years |  |  |  | $ 0.0
Estimated percentage decrease in loss reserve for prior policy years | 0.25% |  | 0.25% |
Estimated decrease in loss reserve for prior policy years | $ 2.9 |  | $ 5.4 |

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