Goodwill and Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified		3 Months Ended			3 Months Ended			3 Months Ended					3 Months Ended			3 Months Ended
	Dec. 31, 2012	Jun. 30, 2013 Intellectual property RangeMark	Dec. 31, 2013 Intellectual property RangeMark	Dec. 31, 2012 Intellectual property RangeMark	Jun. 30, 2013 Trade name RangeMark	Dec. 31, 2013 Trade name RangeMark	Dec. 31, 2012 Trade name RangeMark	Jun. 30, 2013 MBS & Rates segment Customer relationships	Dec. 31, 2013 MBS & Rates segment Customer relationships	Dec. 31, 2012 MBS & Rates segment Customer relationships	Dec. 31, 2013 Credit Products segment Customer relationships	Dec. 31, 2012 Credit Products segment Customer relationships	Jun. 30, 2013 Investment Banking segment Trade name	Dec. 31, 2013 Investment Banking segment Trade name	Dec. 31, 2012 Investment Banking segment Trade name	Mar. 31, 2013 ClearPoint segment Customer relationships	Dec. 31, 2013 ClearPoint segment Customer relationships	Dec. 31, 2012 ClearPoint segment Customer relationships
Intangible assets (amortizable):
Gross carrying amount			$ 1,050	$ 1,050		$ 480	$ 480		$ 641	$ 641	$ 795	$ 795		$ 4,066	$ 4,066		$ 803	$ 803
Accumulated amortization			(87)	(35)		(20)	(8)		(476)	(463)	(795)	(768)		(1,134)	(1,057)		(216)	(201)
Impairment of intangible asset		(963)			(460)			(165)					(2,932)			(587)
Net carrying amount	$ 5,303			$ 1,015			$ 472			$ 178		$ 27			$ 3,009			$ 602