Costs Associated with Exit or Disposal Activities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended					12 Months Ended	9 Months Ended		9 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Third Quarter 2010 Exit Plan [Member]	Sep. 30, 2011 Third Quarter 2010 Exit Plan [Member]	Dec. 31, 2011 Third Quarter 2010 Exit Plan [Member]	Dec. 31, 2011 ICT Restructuring Plan [Member]	Sep. 30, 2012 Fourth Quarter 2010 Exit Plan [Member]	Dec. 31, 2011 Fourth Quarter 2010 Exit Plan [Member]	Sep. 30, 2012 EMEA [Member] Fourth Quarter 2011 Exit Plan [Member] Seat Employees	Dec. 31, 2011 EMEA [Member] Fourth Quarter 2011 Exit Plan [Member]	Sep. 30, 2012 EMEA [Member] Fourth Quarter 2011 Exit Plan [Member] Direct salaries and related cost [Member]	Sep. 30, 2012 EMEA [Member] Fourth Quarter 2011 Exit Plan [Member] General and administrative [Member]	Sep. 30, 2012 Americas [Member]	Sep. 30, 2011 Americas [Member]	Sep. 30, 2012 Americas [Member]	Sep. 30, 2011 Americas [Member]	Sep. 30, 2012 Americas [Member] Fourth Quarter 2011 Exit Plan [Member] Employees Seat	Sep. 30, 2012 Americas [Member] Fourth Quarter 2011 Exit Plan [Member] Employees Seat	Dec. 31, 2011 Americas [Member] Fourth Quarter 2011 Exit Plan [Member]	Sep. 30, 2011 Americas [Member] Third Quarter 2010 Exit Plan [Member]
Restructuring Cost and Reserve [Line Items]
Estimated seat rationalization associated with exit or disposal activities											900								900	900
Estimated employee rationalization associated with exit or disposal activities											500								300	300
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	$ 7,600,000	$ 7,600,000							$ 1,900,000	$ 1,900,000	$ 1,000,000
Increase in restructuring reserve estimated exit and disposal activities costs																			400,000	900,000
Impairment of long-lived assets	122,000	38,000	271,000	764,000		3,800,000			200,000		500,000				100,000	100,000	100,000	100,000		500,000		700,000
Estimated facility-related, program transfer, severance-related and other costs											7,100,000									1,400,000
Cash payment related to restructuring plan					4,100,000			1,900,000	1,300,000		5,700,000									300,000
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
Severance-related costs													700,000
Severance-related costs and legal-related costs														500,000
Estimated facility-related and program transfer costs					6,700,000				1,800,000
Estimated severance-related costs									$ 200,000
Number of closed customer contact management centers					4