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Fair Value Measurements - Fair Value Measurements on a Recurring and Non-Recurring Basis - Additional Information (Detail) (Government Solutions [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Government Solutions [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Goodwill fair value $ 19.0us-gaap_GoodwillFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= kfrc_GovernmentSolutionsMember