ORGANIZATION AND BASIS OF PRESENTATION (Details)		6 Months Ended
	Mar. 13, 2019 $ / shares shares	Jun. 30, 2019 partnership_interest vote
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Limited liability company (LLC) ownership interest		100.00%
Number of limited partnership interests | partnership_interest		1
Number of votes per class A unit		1
Number of votes per class B unit		10
Brookfield Merger Agreement
Subsidiary, Sale of Stock [Line Items]
OSC class A, cash consideration (in USD per share) | $ / shares	$ 49.00
Shares of Brookfield issued (in shares) | shares	1.0770
Share and cash pro ration	50.00%
Brookfield | Brookfield Merger Agreement
Subsidiary, Sale of Stock [Line Items]
Percentage of business acquired by Brookfield	62.00%
Brookfield | Brookfield Asset Management Inc. Merger Agreement, OCGH Unitholders
Subsidiary, Sale of Stock [Line Items]
Percentage of business acquired by Brookfield	20.00%
OCGH | Brookfield Merger Agreement
Subsidiary, Sale of Stock [Line Items]
Percentage of business owned by OCGH	38.00%