Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 years	Feb. 28, 2010	Feb. 11, 2010	Dec. 31, 2011 Other Commitments [Member]	Dec. 31, 2011 EGL [Member]	Dec. 31, 2011 Trilantic [Member]	Dec. 31, 2011 Operating Leases [Member]	Dec. 31, 2010 Operating Leases [Member]	Dec. 31, 2009 Operating Leases [Member]	Dec. 31, 2011 Office Equipment [Member]	Dec. 31, 2010 Office Equipment [Member]	Dec. 31, 2009 Office Equipment [Member]	Dec. 31, 2011 Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Lease expiration date								2023
Rental expense relating to operating leases								$ 16,136,000	$ 12,977,000	$ 8,967,000	$ 510,000	$ 593,000	$ 511,000
Other assets	11,718,000	8,972,000												5,000,000
Increase of annual base rental payments of office space	2,200
Unfunded commitments for capital contributions					5,782,000
Minimum term of contracts		1
Maximum term of contracts		3
Aggregate minimum annual payments		500,000
Cancellation fees		820,000
Increase In Amounts Due Pursuant To Tax Receivable Agreements					137,448,000
Contractual obligations related to the Tax Receivable Agreements	143,660,000
Payment to the counterparties to the Tax Receivable Agreement, within one year or less					6,217,000
Payment to the counterparties to the Tax Receivable Agreement, one to three years					21,650,000
Payment to the counterparties to the Tax Receivable Agreement, three to five years					24,078,000
Payment to the counterparties to the Tax Receivable Agreement, after five years					91,715,000
Minimum commitment in equity fund							50,000,000
Minimum commitment in member's equity fund						50,000,000
Issue of restricted share equivalents			500	500
LP units exchangeable on one-for-one basis or redeemed for cash	16,500,000
Line of credit intra-day facility	7,200,000
Basis points	10.00%
Percentage commitment of total capital commitments	2.50%
Remaining Commitment To Be Paid	$ 5,409,000