Reporting Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 Reportable_Segment		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of reportable segments (in segments)									3
Term for Master Statement of Work											3 years
Optional term for Master Statement of Work											3 years
Revenue	$ 270,543	$ 279,390	$ 274,398	$ 280,627	$ 267,954	$ 272,474	$ 262,739	$ 256,636	$ 1,104,958		$ 1,059,803		$ 926,289
Gross profit	53,476	54,720	55,528	55,685	56,269	57,742	56,960	54,330	219,409		225,301		193,963
Operating profit (loss)	8,004	9,009	7,864	7,389	(503)	4,421	13,704	2,753	32,266	[1],[2],[3]	20,375	[1],[2],[3]	(307)	[1],[2],[3]
Less equity in losses of affiliated companies									0		0		2,299
Other (expense) income, net									(251)		(245)		(540)
Income (loss) before income taxes									32,015		20,130		(3,146)
Master Statement of Work, Optional Incremental Extension Term											1 year
GETS [Member]
Segment Reporting Information [Line Items]
Revenue									325,046		323,546		280,552
Gross profit									93,718		96,808		76,903
Operating profit (loss)									25,725		14,979		11,828
PSS [Member]
Segment Reporting Information [Line Items]
Revenue									710,268		667,662		584,421
Gross profit									94,185		95,569		84,685
Operating profit (loss)									20,528		22,187		(2,118)
MRI [Member]
Segment Reporting Information [Line Items]
Revenue									69,644		68,595		61,316
Gross profit									31,506		32,924		32,375
Operating profit (loss)									10,201		9,468		6,943
Corporate [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)									$ (24,188)		$ (26,259)		$ (16,960)
Sales [Member] | IBM [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									20.00%		21.00%		20.00%

[1] In 2011, the Company recorded an aggregate pre-tax charge of $8.1 million to "Restructuring and other related costs" in the consolidated statement of operations. The following table summarizes the amount of restructuring and other related costs recognized during the year ended December 31, 2011, by reporting segment: 2011 GETS $4,467PSS 2,622MRI 372Corporate 639Restructuring and other related costs $8,100

[2] In 2011, the Company's PSS segment recorded a $9.7 million benefit related to the successful legal appeal of the UK OFT matter.

[3] In 2010, the Company's PSS segment recorded an $8.3 million goodwill impairment charge.