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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015 Office	Mar. 31, 2014
Accounting Policies [Abstract]
Number of domestic field offices of parent company	62kfrc_NumberofDomesticFieldOffices
Percentage of net service revenue from international operations (less than)	2.00%	2.00%
Common stock excluded from the computation of dilutive earnings per share	0	0
Dividend declared per share	$ 0.11	$ 0.10

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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