Restructuring Charges (Details) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended									9 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended				3 Months Ended			9 Months Ended			3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2011 Restructuring Plan 2011 Employee	Sep. 30, 2011 Restructuring Plan 2011	Jun. 30, 2011 Restructuring Plan 2011 U.S. Operations	Jun. 30, 2011 Restructuring Plan 2011 U.S. Operations Employee separation and related costs	Jun. 30, 2011 Restructuring Plan 2011 Asia Pacific Operations.	Jun. 30, 2011 Restructuring Plan 2011 Asia Pacific Operations. Consolidation of leased facilities	Jun. 30, 2011 Restructuring Plan 2011 Canadian Operations	Jun. 30, 2011 Restructuring Plan 2011 Canadian Operations Employee separation and related costs	Jun. 30, 2011 Restructuring Plan 2011 European Operations.	Jun. 30, 2011 Restructuring Plan 2011 European Operations. Employee separation and related costs	Sep. 30, 2011 Restructuring Plan 2011 Employee separation and related costs	Jun. 30, 2011 Restructuring Plan 2011 Employee separation and related costs	Sep. 30, 2011 Restructuring Plan 2011 Consolidation of leased facilities	Jun. 30, 2011 Restructuring Plan 2011 Consolidation of leased facilities	Dec. 31, 2010 Westchester Office Closing 2010 U.S. Operations	Sep. 30, 2011 Westchester Office Closing 2010 U.S. Operations	Sep. 30, 2011 Westchester Office Closing 2010 U.S. Operations Employee separation and related costs	Sep. 30, 2011 Westchester Office Closing 2010 U.S. Operations Consolidation of leased facilities	Sep. 30, 2011 Asia Pacific Restructuring 2010 Asia Pacific Operations. Contract termination charges	Dec. 30, 2010 Asia Pacific Restructuring 2010 Japan	Jun. 30, 2010 Asia Pacific Restructuring 2010 Japan	Dec. 31, 2009 2009 restructuring plan Employee	Sep. 30, 2011 2009 restructuring plan	Sep. 30, 2011 2009 restructuring plan Employee separation and related costs	Sep. 30, 2011 2009 restructuring plan Consolidation of leased facilities	Jun. 30, 2010 Japan
Restructuring Charges.
Restructuring charges	$ 17,678,000	$ 2,250,000		$ 17,678,000									$ 17,364,000		$ 314,000		$ 2,300,000		$ 100,000	$ 2,200,000			$ 2,300,000	$ 25,400,000
Translation gains due to substantial liquidation of Japanese subsidiary																						200,000
Restructuring Charges
Balance at the beginning of the period	3,196,000				15,444,000	15,444,000	314,000	314,000	685,000	685,000	1,235,000	1,235,000		17,364,000		314,000		2,254,000	90,000	2,164,000	11,000				930,000	77,000	853,000
Utilized - cash				(9,884,000)									(9,812,000)		(72,000)			(464,000)	(86,000)	(378,000)	(11,000)				(575,000)	(27,000)	(548,000)
Acceleration of share-based compensation in additional paid-in capital				(2,298,000)									(2,298,000)
Other				(49,000)									(56,000)		7,000										3,000	3,000
Balance at the end of the period	7,595,000		17,678,000	5,447,000	15,444,000	15,444,000	314,000	314,000	685,000	685,000	1,235,000	1,235,000	5,198,000	17,364,000	249,000	314,000	2,254,000	1,790,000	4,000	1,786,000					358,000	53,000	305,000
Annual expenses for on-shore operations																												4,000,000
Regulatory capital deployed																												$ 20,000,000
Number of employees terminated			100																					144