Restructuring (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013 item	Jun. 30, 2013
Restructuring
Number of employees impacted	150
Restructuring charges
Cash charges	$ 32,759,000	$ 34,183,000
Non-cash charges	10,868,000	11,903,000
Restructuring expenses - Total:	43,627,000	46,086,000
Severance compensation | Minimum
Restructuring charges
Remaining Estimated Severance Exposure		500,000
Severance compensation | Maximum
Restructuring charges
Remaining Estimated Severance Exposure		1,000,000
Investment banking
Restructuring charges
Cash charges	1,679,000	1,679,000
Non-cash charges	3,186,000	3,186,000
Investment banking | Severance compensation
Restructuring charges
Cash charges	1,417,000	1,417,000
Investment banking | Third party vendor contracts and other costs
Restructuring charges
Cash charges	262,000	262,000
Investment banking | Intangible asset impairment
Restructuring charges
Non-cash charges	2,932,000	2,932,000
Investment banking | Stock-based compensation vesting
Restructuring charges
Non-cash charges	254,000	254,000
Fixed Income businesses
Restructuring charges
Cash charges	13,704,000	13,704,000
Non-cash charges	4,069,000	4,069,000
Fixed Income businesses | Severance compensation
Restructuring charges
Cash charges	8,061,000	8,061,000
Fixed Income businesses | Third party vendor contracts and other costs
Restructuring charges
Cash charges	5,643,000	5,643,000
Fixed Income businesses | Stock-based compensation vesting
Restructuring charges
Non-cash charges	3,681,000	3,681,000
Fixed Income businesses | Goodwill & intangible asset impairment
Restructuring charges
Non-cash charges	388,000	388,000
ClearPoint
Restructuring charges
Cash charges	(48,000)	1,376,000
Non-cash charges		1,035,000
ClearPoint | Severance compensation
Restructuring charges
Cash charges		1,263,000
ClearPoint | Third party vendor contracts and other costs
Restructuring charges
Cash charges	(48,000)	113,000
ClearPoint | Intangible asset impairment
Restructuring charges
Non-cash charges		587,000
ClearPoint | Deferred compensation and other charges
Restructuring charges
Non-cash charges		448,000
Other
Restructuring charges
Cash charges	17,424,000	17,424,000
Non-cash charges	3,613,000	3,613,000
Other | Severance compensation
Restructuring charges
Cash charges	669,000	669,000
Other | Reserve for lease commitments
Restructuring charges
Cash charges	16,755,000	16,755,000
Other | Stock-based compensation vesting
Restructuring charges
Non-cash charges	138,000	138,000
Other | Impairment of fixed assets and leasehold improvements
Restructuring charges
Non-cash charges	$ 3,475,000	$ 3,475,000