XML 61 R45.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Summary of Significant Accounting Policies - Health Insurance (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($)
Accounting Policies [Abstract] |
Health insurance maximum risk of loss liability per employee insurance plan (up to) | $ 600
Health insurance annual aggregate risk of loss liability, per employee, in excess of stop loss maximum (up to) | $ 280

X
- 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

X
- 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

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