NON-CONTROLLING REDEEMABLE INTERESTS IN CONSOLIDATED FUNDS (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Non-Controlling Redeemable Interests in Consolidated Funds
Beginning balance	$ 344,047	$ 38,173,125
Cumulative-effect adjustment from adoption of accounting guidance	0	(37,969,042)
Initial consolidation of a fund	70,817	0
Contributions	95,932	64,321
Distributions	(31,655)	(21,919)
Net income	12,603	1,989
Change in distributions payable	5,662	(822)
Foreign currency translation and other	0	1,605
Ending balance	$ 497,406	$ 249,257