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Quarterly Financial Data (Unaudited) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]    
Gain on sale of discontinued operations before income tax $ 94.3us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax  
Gain on sale of discontinued operations after income tax 56.1us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax  
Transaction costs 11.0kfrc_DiscontinuedOperationsTransactionExpensesRelatedToDivestitureOfBusiness  
Employee Benefits and Share-based Compensation 2.4us-gaap_EmployeeBenefitsAndShareBasedCompensation  
Severance and termination-related expenses   7.1us-gaap_SeveranceCosts1
Discretionary bonus   $ 3.6kfrc_DiscretionaryBonusPaid