FAIR VALUE - Valuation Techniques (Details) - Oaktree Capital Group Excluding Consolidated Funds - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 19,169	$ 34,934
Corporate investment – Limited partnership interests \| Market approach (value of underlying assets) \| Level III
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 23,334	$ 30,311

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Name:	us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant