Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net revenues	$ 442,640	$ 441,282	$ 427,421
Operating expenses:
Cost of services (excluding depreciation and amortization)	270,559	279,901	265,333
Selling, general, and administrative expenses (excluding depreciation and amortization)	118,706	120,006	107,534
Depreciation and amortization	18,136	17,416	16,331
Business and systems integration expenses	7,488	12,086	8,467
Acquisition integration and restructuring expenses	1,774	5,256	1,438
Foreign exchange loss	1,286	1,823	1,112
Impairment of long-lived assets	502	4,281	40
Multiemployer pension withdrawal expense	0	31,480	1,846
Operating income (loss)	24,189	(30,967)	25,320
Other income (expense):
Interest income	255	129	59
Interest expense	(4,324)	(3,652)	(5,270)
Income (loss) from continuing operations before income taxes	20,120	(34,490)	20,109
Income tax provision (benefit)	6,902	(10,872)	697
Income (loss) from continuing operations	13,218	(23,618)	19,412
Income (loss) from discontinued operations, net of tax	(6,693)	202	1,199
Net income (loss)	6,525	(23,416)	20,611
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 0.50	$ (0.91)	$ 0.75
Income (loss) from discontinued operations (in dollars per share)	$ (0.25)	$ 0.01	$ 0.05
Net income (loss) per common share (in dollars per share)	$ 0.25	$ (0.90)	$ 0.80
Diluted:
Income (loss) from continuing operations (in dollars per share)	$ 0.50	$ (0.91)	$ 0.74
Income (loss) from discontinued operations (in dollars per share)	$ (0.25)	$ 0.01	$ 0.05
Net income (loss) per common share (in dollars per share)	$ 0.25	$ (0.90)	$ 0.79
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	26,286	25,924	25,790
Diluted (in shares)	26,354	25,924	26,080
Dividends per Class A common share (in dollars per share)	$ 0.32	$ 0.32	$ 0.32
Net income (loss)	6,525	(23,416)	20,611
Foreign currency translation adjustments	(1,117)	2,779	(2,167)
Pension liability adjustments	(137)	0	0
Comprehensive income (loss)	$ 5,271	$ (20,637)	$ 18,444