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Stock Incentive Plans - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
employee
Apr. 05, 2013
Jun. 20, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,300,000us-gaap_AllocatedShareBasedCompensationExpense $ 800,000us-gaap_AllocatedShareBasedCompensationExpense    
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    
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ 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    
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]        
Restricted stock granted, vesting period 5 years      
Restricted stock granted, vesting percentage 20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Total unrecognized compensation expenses 19,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Weighted average period expected to be recognized 4 years 8 months 12 days      
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 $ 1,300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
$ 800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember