Goodwill and Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Intangible assets (amortizable):
Impairment of intangible asset	$ (587)
Net carrying amount	4,551		5,303
Total amortization expense from continuing operations	165	124
Customer relationships | MBS & Rates segment
Intangible assets (amortizable):
Gross carrying amount	641		641
Accumulated amortization	(476)		(463)
Net carrying amount	165		178
Customer relationships | Credit Products segment
Intangible assets (amortizable):
Gross carrying amount	795		795
Accumulated amortization	(795)		(768)
Net carrying amount			27
Customer relationships | ClearPoint segment
Intangible assets (amortizable):
Gross carrying amount	803		803
Accumulated amortization	(216)		(201)
Impairment of intangible asset	(587)
Net carrying amount			602
Intellectual property
Intangible assets (amortizable):
Amortization period	5 years
Intellectual property | RangeMark
Intangible assets (amortizable):
Gross carrying amount	1,050		1,050
Accumulated amortization	(87)		(35)
Net carrying amount	963		1,015
Trade name | RangeMark
Intangible assets (amortizable):
Gross carrying amount	480		480
Accumulated amortization	(20)		(8)
Net carrying amount	460		472
Trade name | Minimum
Intangible assets (amortizable):
Amortization period	10 years
Trade name | Maximum
Intangible assets (amortizable):
Amortization period	20 years
Trade name | Investment Banking segment
Intangible assets (amortizable):
Gross carrying amount	4,066		4,066
Accumulated amortization	(1,103)		(1,057)
Net carrying amount	$ 2,963		$ 3,009