Investments - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended								12 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 EMP III [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2012 EMP III [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2013 Trilantic [Member]	Dec. 31, 2012 Trilantic [Member]	Dec. 31, 2010 Trilantic [Member]	Dec. 31, 2013 G5 Evercore [Member]	Dec. 31, 2012 G5 Evercore [Member]	Dec. 31, 2011 G5 Evercore [Member]	Dec. 31, 2013 ABS [Member]	Dec. 31, 2012 ABS [Member]	Dec. 31, 2013 Pan [Member]	Dec. 31, 2012 Pan [Member]	Dec. 31, 2011 Pan [Member]	Mar. 16, 2013 Pan [Member]	Mar. 15, 2013 Pan [Member]	Dec. 31, 2008 Pan [Member]	Dec. 31, 2010 CSI Capital [Member]	Dec. 31, 2013 Minimum [Member] ECP II [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2013 Maximum [Member] ECP II [Member] Variable Interest Entity, Primary Beneficiary [Member]	Dec. 31, 2013 EMCP III [Member]	Dec. 31, 2013 EMCP III [Member] EMP III [Member]	Dec. 31, 2013 EMCP III [Member] Parent [Member]	Dec. 31, 2013 EMCP III [Member] Noncontrolling Interest [Member]	Dec. 31, 2013 Trilantic [Member]	Dec. 31, 2012 Trilantic [Member]	Dec. 31, 2013 Trilantic [Member] Trilantic IV [Member]	Dec. 31, 2012 Trilantic [Member] Trilantic IV [Member]	Dec. 31, 2013 Trilantic [Member] Trilantic V [Member]	Dec. 31, 2013 Trilantic V [Member]
Schedule of Investments [Line Items]
Subscribed capital commitments																															$ 201,000,000
Capital commitment																																10,750,000	1,000,000	9,750,000					5,000,000
Unfunded commitments for capital contributions	9,945,000								9,945,000					4,265,000																		6,864,000	639,000						4,265,000
Equity method investment	67,560,000				69,320,000				67,560,000	69,320,000							20,001,000	19,720,000		47,559,000	46,851,000	0	2,749,000				4,158,000													1,532,000
Investment																												3,164,000							14,145,000	14,999,000	29,000	1,091,000	825,000
Net realized and unrealized gains (losses) on private equity fund investments, including performance fees									8,060,000	(206,000)	6,200,000
Previously received carried interest subject to repayment	2,701,000								2,701,000
Percent ownership of carried interest																													8.00%	9.00%
Consolidated assets												4,287,000	1,696,000
Consolidated liabilities												32,000
Issued LP Units (in shares)																500,000
Limited partnership investment	36,805,000				49,727,000				36,805,000	49,727,000					16,331,000	16,090,000
Equity method investment (as a percent)																	49.00%			45.00%					68.00%	50.00%
Income (loss) from equity method investments	5,993,000	562,000	1,015,000	756,000	1,333,000	415,000	719,000	2,385,000	8,326,000	4,852,000	919,000						2,126,000	1,368,000	1,340,000	6,255,000	3,394,000	(55,000)	90,000	(420,000)
Amortization of intangible assets									$ 2,586,000	$ 2,696,000	$ 944,000