UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net service revenues	$ 322,201	$ 312,611
Direct costs of services	225,012	217,871
Gross profit	97,189	94,740
Selling, general and administrative expenses	85,568	82,352
Depreciation and amortization	2,327	2,397
Income from operations	9,294	9,991
Other expense, net	555	453
Income before income taxes	8,739	9,538
Income tax expense	5,089	3,753
Net income	3,650	5,785
Other comprehensive (loss) income:
Defined benefit pension plans, net of tax	(3)	1
Comprehensive income	$ 3,647	$ 5,786
Earnings per share – basic (in dollars per share)	$ 0.14	$ 0.20
Earnings per share – diluted (in dollars per share)	$ 0.14	$ 0.20
Weighted average shares outstanding – basic (in shares)	26,693	28,276
Weighted average shares outstanding – diluted (in shares)	26,842	28,475
Dividends declared per share (in dollars per share)	$ 0.12	$ 0.11