Costs Associated with Exit or Disposal Activities (Details Textual) (USD $)	3 Months Ended				12 Months Ended	3 Months Ended				3 Months Ended		12 Months Ended		3 Months Ended				3 Months Ended	12 Months Ended	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Americas [Member]	Mar. 31, 2012 Third Quarter 2010 Exit Plan [Member] Center	Dec. 31, 2011 Third Quarter 2010 Exit Plan [Member]	Mar. 31, 2012 Third Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Mar. 31, 2011 Third Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Dec. 31, 2011 Third Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Dec. 31, 2010 Third Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Mar. 31, 2011 Third Quarter 2010 Exit Plan [Member] Americas [Member]	Mar. 31, 2012 Fourth Quarter 2010 Exit Plan [Member]	Dec. 31, 2010 Fourth Quarter 2010 Exit Plan [Member]	Dec. 31, 2011 Fourth Quarter 2010 Exit Plan [Member]	Mar. 31, 2012 Fourth Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Mar. 31, 2011 Fourth Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Dec. 31, 2011 Fourth Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Dec. 31, 2010 Fourth Quarter 2010 Exit Plan [Member] Lease obligations and facility exit costs [Member]	Mar. 31, 2012 ICT Restructuring Plan [Member]	Dec. 31, 2011 ICT Restructuring Plan [Member]	Mar. 31, 2011 ICT Restructuring Plan [Member] Lease obligations and facility exit costs [Member]	Mar. 31, 2012 ICT Restructuring Plan [Member] Lease obligations and facility exit costs [Member]	Dec. 31, 2010 ICT Restructuring Plan [Member] Lease obligations and facility exit costs [Member]	Mar. 31, 2012 Fourth Quarter 2011 Exit Plan [Member] Americas [Member]	Dec. 31, 2011 Fourth Quarter 2011 Exit Plan [Member] Americas [Member] NumberOfSeats Employees	Mar. 31, 2012 Fourth Quarter 2011 Exit Plan [Member] EMEA [Member]	Mar. 31, 2011 Fourth Quarter 2011 Exit Plan [Member] EMEA [Member]	Dec. 31, 2011 Fourth Quarter 2011 Exit Plan [Member] EMEA [Member] Employees NumberOfSeats	Mar. 31, 2012 Fourth Quarter 2011 Exit Plan [Member] EMEA [Member] Lease obligations and facility exit costs [Member]	Dec. 31, 2011 Fourth Quarter 2011 Exit Plan [Member] EMEA [Member] Lease obligations and facility exit costs [Member]
Restructuring Cost and Reserve [Line Items]
Estimated seat rationalization associated with exit or disposal activities																								1,200			900
Accrued liability associated with exit plans						$ 2,950,000	$ 5,619,000	$ 3,427,000	$ 6,141,000					$ 764,000	$ 1,452,000	$ 835,000	$ 1,711,000	$ 0		$ 817,000	$ 0	$ 1,462,000	$ 0		$ 5,828,000		$ 5,060,000	$ 595,000	$ 577,000
Estimated revenue migrated associated with exit or disposal activities																											3,200,000
Estimated revenue not migrated associated with exit or disposal activities																											18,800,000
Estimated employee rationalization associated with exit or disposal activities																								500			500
Estimated total costs, some of which may have already been incurred, under the restructuring plan				10,500,000	10,500,000						2,200,000		2,200,000										1,000,000		7,600,000
Number of closed customer contact management center				4
Impairment of long-lived assets	149,000	726,000	100,000		3,800,000					700,000		200,000												500,000			500,000
Estimated facility-related, program transfer, severance-related and other costs																									7,100,000
Estimated facility-related and program transfer costs				6,700,000							1,800,000												500,000
Estimated severance-related costs											200,000
Charges (reversals) of exit or disposal activities and related charges							220,000								70,000			0		(262,000)					999,000	0
Cash payment related to restructuring plan				$ 3,800,000							$ 1,200,000								$ 1,900,000				$ 0		$ 1,100,000