Restructuring Charges (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended			6 Months Ended				3 Months Ended		6 Months Ended			3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Restructuring Plan 2011	Jun. 30, 2011 Restructuring Plan 2011 Employee separation and related costs	Jun. 30, 2011 Restructuring Plan 2011 Consolidation of leased facilities	Jun. 30, 2011 WestchesterOffice Closing 2010 U.S. Operations	Jun. 30, 2011 WestchesterOffice Closing 2010 U.S. Operations Employee separation and related costs	Jun. 30, 2011 WestchesterOffice Closing 2010 U.S. Operations Consolidation of leased facilities	Jun. 30, 2011 AsiaPacific Restructuring 2010 Asia Pacific Operations. Contract termination charges	Jun. 30, 2010 AsiaPacific Restructuring 2010 Japan	Dec. 31, 2009 2009 restructuring plan	Jun. 30, 2011 2009 restructuring plan	Jun. 30, 2011 2009 restructuring plan Employee separation and related costs	Jun. 30, 2011 2009 restructuring plan Consolidation of leased facilities	Jun. 30, 2010 Japan
Restructuring Charges.
Restructuring charges	$ 17,678,000	$ 2,337,000	$ 17,678,000	$ 2,250,000	$ 17,700,000	$ 17,400,000	$ 300,000	$ 2,300,000	$ 100,000	$ 2,200,000		$ 2,100,000	$ 25,400,000
Restructuring Charges
Balance at the beginning of the period			3,196,000					2,254,000	90,000	2,164,000	11,000			930,000	77,000	853,000
Utilized - cash								(345,000)	(82,000)	(263,000)	(11,000)			(387,000)	(27,000)	(360,000)
Other														3,000	3,000
Balance at the end of the period	17,837,000		17,837,000					1,909,000	8,000	1,901,000				546,000	53,000	493,000
Annual expenses for on-shore operations																	4,000,000
Regulatory capital deployed																	$ 20,000,000
Number of employees terminated					100								144