Fair Value Measurements for Operating Entities and Consolidated Funds Fair Value Inputs, Unobservable Inputs, Quantitative Information (Details) (Operating Entities, USD $) In Thousands, unless otherwise specified						12 Months Ended								12 Months Ended
	Dec. 31, 2013 Income Approach and Market Approach Valuation Techniques Common and Preferred Stock	Dec. 31, 2013 Market Approach Valuation Technique Warrants and Rights	Dec. 31, 2013 Level 3	Dec. 31, 2013 Level 3 Other Assets and Liabilities		Dec. 31, 2013 Level 3 Income Approach and Market Approach Valuation Techniques Common and Preferred Stock Minimum	Dec. 31, 2013 Level 3 Income Approach and Market Approach Valuation Techniques Common and Preferred Stock Maximum	Dec. 31, 2013 Level 3 Market Approach Valuation Technique Warrants and Rights	Dec. 31, 2013 Level 3 Market Approach Valuation Technique Warrants and Rights Minimum	Dec. 31, 2013 Level 3 Market Approach Valuation Technique Warrants and Rights Maximum	Dec. 31, 2012 Contingent liability payable [Member]	Dec. 31, 2011 Contingent liability payable [Member]	Dec. 31, 2013 Contingent liability payable [Member] Income Approach Valuation Technique [Member]	Dec. 31, 2013 Contingent liability payable [Member] Level 3 Income Approach and Market Approach Valuation Techniques Minimum	Dec. 31, 2013 Contingent liability payable [Member] Level 3 Income Approach and Market Approach Valuation Techniques Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
DCF discount rate														0.00%	15.00%
Market multiple						2	3
Volatility									20.00%	100.00%
Investments at fair value	$ 3,474	$ 5,805	$ 16,216
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value											8,116	0	6,937
Assets and liabilities at fair value			$ 233,206	$ 216,990	[1]
Fair Value Assumptions, Weighted Average Volatility Rate								37.00%

[1] Quantitative disclosures of unobservable inputs and assumptions are not required for investments for which NAV per share is used as a practical expedient to determine fair value, as their redemption features rather than observability of inputs cause them to be classified as a level 3 type asset within the fair value hierarchy. In addition, the fair value of the Consolidated Funds' investments are determined based on net asset value and therefore quantitative disclosures are not included in the table above. The quantitative disclosures also exclude financial instruments for which the determination of fair value is based on prices from prior transactions.