Investments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Investments
Fair value of investments	$ 17,884,000		$ 17,884,000		$ 20,478,000
Total investment gains/(losses)	92,000	163,000	(338,000)	156,000
Unrecognized carried interest	2,300,000		2,300,000		1,600,000
Payable to former employees	1,001,000		1,001,000		941,000
Investment in FATV
Investments
Fair value of investments	14,918,000		14,918,000		17,110,000
Total investment gains/(losses)	1,043,000	137,000	1,126,000	167,000
Open commitments to fund portfolio	0		0
Total partnership capital	64,800,000		64,800,000		70,900,000
Share in management fee income	200,000	200,000	500,000	500,000
Employee Investment Funds, net of Company's ownership interest
Investments
Fair value of investments	1,366,000		1,366,000		1,218,000
Total investment gains/(losses)	20,000	26,000	33,000	(11,000)
Payable to former employees	1,000,000		1,000,000		900,000
Other investments
Investments
Fair value of investments	1,600,000		1,600,000		2,150,000
Total investment gains/(losses)	$ (971,000)		$ (1,497,000)