UNITHOLDERS' CAPITAL - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Aug. 09, 2018	May 17, 2018	Feb. 12, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Total unitholders’ capital				$ 1,702,169	$ 2,487,717	$ 2,020,617	$ 1,885,171
Preferred redemption price (in dollars per share)				$ 25.00
Preferred redemption price, change of control event (in dollars per share)				$ 25.25
Redemption notice period				30 days
Redemption notice period after change in control event				60 days
Redemption period after tax redemption				60 days
Preferred redemption price, tax redemption event (in dollars per share)				$ 25.50
OCGH
Class of Stock [Line Items]
Unitholders' capital (in shares)				61,793,286	85,471,937
Total unitholders’ capital				$ 503,253	$ 1,086,693
Oaktree Operating Group
Class of Stock [Line Items]
Subsidiary units outstanding (in shares)				159,760,541	157,133,560
Total unitholders’ capital				$ 1,301,066	$ 1,997,745
Equity Held by Third Parties
Class of Stock [Line Items]
Non-controlling interests in consolidated funds				$ 0	$ 5,661
Public Offering
Class of Stock [Line Items]
Number of units issued and sold (in shares)			5,000,000
Net proceeds from units sold			$ 219,500
Series A Preferred Units
Class of Stock [Line Items]
Net proceeds from units sold		$ 173,700
Preferred dividend rate		6.625%
Preferred redemption price (in dollars per share)		$ 25.00
Series A Preferred Units | Preferred Unit Issuance
Class of Stock [Line Items]
Number of units issued and sold (in shares)		7,200,000
Series B Preferred Units
Class of Stock [Line Items]
Net proceeds from units sold	$ 226,900
Preferred dividend rate	6.55%
Preferred redemption price (in dollars per share)	$ 25.00
Series B Preferred Units | Preferred Unit Issuance
Class of Stock [Line Items]
Number of units issued and sold (in shares)	9,400,000