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Discontinued Operations - Summary of Results from Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Discontinued Operations [Line Items]      
Net service revenues $ 56,670us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 78,159us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 76,992us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Income from discontinued operations, before income taxes 103,512us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 9,169us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 10,792us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Kforce Clinical Research, Inc [Member]      
Schedule of Discontinued Operations [Line Items]      
Net service revenues     29,808us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kfrc_KforceClinicalResearchIncMember
Income from discontinued operations, before income taxes     $ 39,735us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kfrc_KforceClinicalResearchIncMember