EARNINGS PER UNIT - Computations of Net Income (Loss) Per Unit (Parenthetical) (Detail)	Mar. 31, 2013
Earnings Per Share [Line Items]
OCGH Issued	120,763,876
Common Class A [Member]
Earnings Per Share [Line Items]
OCGH units represented	120,763,876

Potential additional Class A units issuable through March two thousand twenty three through conversion of units held by noncontrolling interest.

No definition available.

Name:	oak_PotentialAdditionalClassUnitsIssuableThroughMarchTwoThousandTwentyThreeThroughConversionOfUnitsHeldByNoncontrollingInterest
Namespace Prefix:	oak_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant