SEGMENT REPORTING - EBT Recon - Performance earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Total Segments
Performance related earnings:
Economic net income	$ 158,612	$ 112,851	$ 229,484	$ 233,636
Fee related earnings	(83,163)	(83,365)	(168,486)	(168,842)
Performance related earnings	75,449	29,486	60,998	64,794
OMG
Performance related earnings:
Economic net income	(56,261)	(36,878)	(102,985)	(74,733)
Fee related earnings	43,598	$ 36,878	89,873	$ 74,733
Performance related earnings	$ (12,663)		$ (13,112)