SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Noncontrolling Interests in Consolidated Entities (Details)		9 Months Ended
	Mar. 17, 2016	Sep. 30, 2016
Accounting Policies [Abstract]
Percentage of carried interest received by general partners (up to)		1.00%
Percentage of other profits (losses) received by general partners		1.00%
Series A LLC Preferred Stock
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred units dividend rate (as a percent)	6.75%
Series A LLC Preferred Stock | KFN
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Preferred units dividend rate (as a percent)		7.375%