Reporting Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 Reportable_Segment		Dec. 31, 2012		Dec. 31, 2011
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	$ 277,114		$ 277,916		$ 263,363		$ 269,466		$ 270,543	$ 279,390	$ 274,398	$ 280,627	$ 1,087,859		$ 1,104,958		$ 1,059,803
Gross profit	52,248		52,697		51,545		50,151		53,476	54,720	55,528	55,685	206,641		219,409		225,301
Operating profit (loss)	3,815	[1],[2],[3]	6,946	[1],[2],[3]	5,242	[1],[2],[3]	4,913	[1],[2],[3]	8,004	9,009	7,864	7,389	20,916	[2],[4],[5]	32,266	[4],[5]	20,375	[4],[5]
Other (expense) income, net													(268)		(251)		(245)
Income before income taxes													20,648		32,015		20,130
Master Statement of Work, Optional Incremental Extension Term																	1 year
GETS [Member]
Segment Reporting Information [Line Items]
Revenue													321,289		325,046		323,546
Gross profit													89,801		93,718		96,808
Operating profit (loss)													25,150		25,725		14,979
PSS [Member]
Segment Reporting Information [Line Items]
Revenue													708,598		710,268		667,662
Gross profit													89,546		94,185		95,569
Operating profit (loss)													12,621		20,528		22,187
MRI [Member]
Segment Reporting Information [Line Items]
Revenue													57,972		69,644		68,595
Gross profit													27,294		31,506		32,924
Operating profit (loss)													8,549		10,201		9,468
Corporate [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)													$ (25,404)		$ (24,188)		$ (26,259)
Sales [Member] | IBM [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage													19.00%		20.00%		21.00%

[1] In 2013, the Company's GETS segment recorded a $1.8 million benefit to "Operating and administrative expenses" related to the reduction of an acquisition-related earnout liability (by quarter: first $0.3 million, second $0.4 million, third $0.5 million and fourth $0.6 million.)

[2] In the fourth quarter of 2013, the Company recorded a $5.7 million charge to "Restructuring and other related costs" related to the 2013 Restructuring Plan.

[3] In the fourth quarter of 2013, the Company recorded a $3.3 million benefit to "Operating and administrative expenses" related to the settlement of legal claims pursued by the Company.

[4] In 2013 and 2011, the Company recorded pre-tax charges of $5.7 million and $8.1 million, respectively, to "Restructuring and other related costs" related to the 2013 and 2011 Restructuring Plans. The following table summarizes the amount of restructuring and other related costs recognized by reporting segment for the indicated periods: Year ended December 31, 2013 2012 2011 GETS $2,132 $— $4,467PSS 2,394 — 2,622MRI 215 — 372Corporate 975 — 639Restructuring and other related costs $5,716 $— $8,100

[5] In 2011, the Company's PSS segment recorded a $9.7 million benefit to "Operating and administrative expenses" related to the successful legal appeal of the UK OFT matter.