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Stock Incentive Plans - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
employee
Dec. 31, 2013
Participant
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Apr. 05, 2013
Jun. 20, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense     $ 5,500,000us-gaap_AllocatedShareBasedCompensationExpense $ 2,600,000us-gaap_AllocatedShareBasedCompensationExpense $ 26,200,000us-gaap_AllocatedShareBasedCompensationExpense      
Related tax benefit     1,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 1,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 10,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense      
Restricted shares impacted by modification 268,000kfrc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfSharesAffected              
Number of employees impacted by modification 87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationNumberOfEmployeesAffected              
Incremental compensation cost resulting from modification 109,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost              
ERROR in label resolution.   2kfrc_NumberOfParticipantsTerminated            
Unrecorded stock compensation expenses   1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost            
Health Information Management [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecorded stock compensation expenses     600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kfrc_HealthInformationManagementMember
         
Kforce Clinical Research, Inc [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Related tax benefit           800,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kfrc_KforceClinicalResearchIncMember
   
Unrecorded stock compensation expenses   22,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kfrc_KforceClinicalResearchIncMember
      31,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kfrc_KforceClinicalResearchIncMember
   
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense including discontinued operations     0kfrc_ShareBasedCompensationIncludingDiscontinuedOperations
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0kfrc_ShareBasedCompensationIncludingDiscontinuedOperations
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0kfrc_ShareBasedCompensationIncludingDiscontinuedOperations
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Unrecognized compensation cost     0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Performance Accelerated Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock granted, vesting period 5 years              
Closing stock price measurement period     10 days          
Performance Accelerated Restricted Stock [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock granted, vesting period   6 years            
Performance Accelerated Restricted Stock [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock granted, vesting period   10 years            
Stock Options Outstanding [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Option expiration period from grant date     10 years          
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total unrecognized compensation expenses     11,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
         
Weighted average period expected to be recognized     4 years 9 months 18 days          
Stock-based compensation expense     20% of the grant vesting annually in years six through ten          
Restricted Stock [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock granted, vesting period     2 years          
Restricted Stock [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock granted, vesting period     10 years          
2013 Stock Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized awards             4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= kfrc_TwoThousandThirteenStockIncentivePlanMember
 
Equity plan expiration date     Apr. 05, 2023          
2006 Stock Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized awards               7,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= kfrc_TwoThousandSixStockIncentivePlanMember
Equity plan expiration date     Apr. 28, 2016          
Incentive Stock Option Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity plan ceased year     2005          
Continuing Operations [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense     3,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
2,600,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
26,200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
     
Common Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense     $ 1,800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Common stock issued     92,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember