Investments in Partnerships, Offshore Funds and Variable Interest Entities, Part I (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Variable Interest Entity [Line Items]
Investments in affiliated entities	$ 80,800,000	$ 86,900,000	$ 83,900,000
Investments in unaffiliated entities	13,500,000	14,800,000	13,600,000
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	4	4	4
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	4	4	4
Investments in Partnerships by Accounting Method [Abstract]
Fair value	23,772,000	23,166,000	26,128,000
Equity Method Investments	70,488,000	78,519,000	71,421,000
Total	94,260,000	101,685,000	97,549,000
Maximum exposure to loss related to VIEs	8,300,000	8,200,000	7,700,000
Deferred carried interest in VIE	45,000	49,000	45,000
Total VIE assets	77,800,000	74,500,000	75,000,000
Unaffiliated [Member]
Investments in Partnerships by Accounting Method [Abstract]
Fair value	0	0	0
Equity Method Investments	6,427,000	7,776,000	6,505,000
Total	6,427,000	7,776,000	6,505,000
VIE [Member]
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	1	1	1
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	1	1	1
Investments in Partnerships by Accounting Method [Abstract]
Total	15,484,000	17,183,000	18,507,000
Prior to Consolidations [Member]
Investments in Partnerships by Accounting Method [Abstract]
Total	99,500,000	109,136,000	100,164,000
CFFs [Member]
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	2	2	2
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	2	2	2
Investments in Partnerships by Accounting Method [Abstract]
Total	3,423,000	990,000	5,388,000
CFFs [Member] | Affiliated [Member]
Investments in Partnerships by Accounting Method [Abstract]
Fair value	23,772,000	23,166,000	26,128,000
Equity Method Investments	0	0	0
Total	23,772,000	23,166,000	26,128,000
CFFs [Member] | VIE [Member]
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	1	1	1
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	1	1	1
Partnerships [Member]
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	1	1	1
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	1	1	1
Investments in Partnerships by Accounting Method [Abstract]
Total	(8,663,000)	(8,441,000)	(8,003,000)
Partnerships [Member] | Affiliated [Member]
Investments in Partnerships by Accounting Method [Abstract]
Fair value	0	0	0
Equity Method Investments	27,477,000	33,374,000	28,158,000
Total	27,477,000	33,374,000	28,158,000
Partnerships [Member] | VIE [Member]
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	0	0	0
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	0	0	0
Offshore Funds [Member]
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	1	1	1
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	1	1	1
Investments in Partnerships by Accounting Method [Abstract]
Total	0	0	0
Offshore Funds [Member] | Affiliated [Member]
Investments in Partnerships by Accounting Method [Abstract]
Fair value	0	0	0
Equity Method Investments	29,551,000	30,398,000	29,679,000
Total	29,551,000	30,398,000	29,679,000
Offshore Funds [Member] | Unaffiliated [Member]
Investments in Partnerships by Accounting Method [Abstract]
Fair value	0	0	0
Equity Method Investments	7,033,000	6,971,000	7,079,000
Total	$ 7,033,000	$ 6,971,000	$ 7,079,000
Offshore Funds [Member] | VIE [Member]
Entities Consolidated [Roll Forward]
Entities consolidated at beginning of period	0	0	0
Additional consolidated entities	0	0	0
Deconsolidated entities	0	0	0
Entities consolidated at end of period	0	0	0