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Summary of Significant Accounting Policies - Health Insurance (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($)
Accounting Policies [Abstract] |
Health insurance maximum risk of loss liability per employee insurance plan (up to) | $ 600,000
Health insurance annual aggregate risk of loss liability, per employee, in excess of stop loss maximum (up to) | $ 200,000

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- Definition Health Insurance Aggregate Risk Of Loss Liability, Amount In Excess Of The Stop Loss Maximum + References No definition available. + Details
Name: | kfrc_HealthInsuranceAggregateRiskOfLossLiabilityAmountInExcessOfTheStopLossMaximum
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Health insurance stop loss maximum per claim. + References No definition available. + Details
Name: | kfrc_HealthInsuranceStopLossMaximumPerClaim
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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