XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.22.1

Commitments and Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Other Commitments [Line Items] |  |  |
Unemployment benefits, possible liability with a change in control | $ 38,200 |  |
Unemployment benefits, possible liability without a change in control | 13,700 |  |
Maximum potential capital contributions | 22,500 |  |
Contributions to date to equity method investment | 22,500 |  |
Contributions to equity method investment | $ (500) | $ (2,000) |
Minimum |  |  |
Other Commitments [Line Items] |  |  |
Renewal terms of current operating leases | 1 year |  |
Maximum |  |  |
Other Commitments [Line Items] |  |  |
Renewal terms of current operating leases | 5 years |  |
WorkLLama |  |  |
Other Commitments [Line Items] |  |  |
Contributions to equity method investment | $ (500) |  | $ (9,000)

X
- Definition Advances To Equity Method Investment, To Date + References No definition available. + Details
Name: | kfrc_AdvancesToEquityMethodInvestmentToDate
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Equity Method Investment, Capital Commitment, Maximum + References No definition available. + Details
Name: | kfrc_EquityMethodInvestmentCapitalCommitmentMaximum
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Supplemental unemployment benefits for employees under contract that are terminated without good cause or the employee resigns for good reason following a change in control. + References No definition available. + Details
Name: | kfrc_SupplementalUnemploymentBenefitsOnChangeInControl
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Supplemental unemployment benefits for employees under contract that are terminated without good cause or the employee resigns for good reason in the absence of a change in control. + References No definition available. + Details
Name: | kfrc_SupplementalUnemploymentBenefitsOnNoChangeInControl
Namespace Prefix: | kfrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=kfrc_WorkLLamaLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |