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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Insurance [Abstract] |  |  |  |  |
Provision for title loss, percentage of title premiums and escrow fees | 4.00% | 5.00% | 4.00% | 5.00% |
Ultimate loss rate |  | 5.00% | 4.00% |  | 4.50%
Estimated increase in loss reserve for prior policy years | $ 0.0 | $ 7.0 |  | $ 18.2 |
Percentage Increase In Loss Reserve Estimates For Prior Policy Years |  | 0.50% |  | 0.50% |

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

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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 increase in loss reserve estimates for prior policy years. + References No definition available. + Details
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Namespace Prefix: | faf_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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