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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014 Office	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014 Office	Jun. 30, 2013
Accounting Policies [Abstract]
Number of domestic field offices of parent company	62			62
Percentage of net service revenue from international operations	2.00%		2.00%	2.00%	2.00%
Common stock excluded from the computation of dilutive earnings per share	0		0	0	0
Dividend declared per share	$ 0.10	$ 0.10		$ 0.20

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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