Debt Instrument, Covenant, Leverage Ratio, Maximum

No definition available.

Name:	oak_DebtInstrumentCovenantLeverageRatioMaximum
Namespace Prefix:	oak_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Holding Percentage

+ References

No definition available.

+ Details

Name:	oak_DebtInstrumentHoldingPercentage
Namespace Prefix:	oak_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Maturity Period, Period Extension Option, Term

+ References

No definition available.

+ Details

Name:	oak_DebtInstrumentMaturityPeriodPeriodExtensionOptionTerm
Namespace Prefix:	oak_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of debt obligation, decrease in value due to increase in average borrowing rate.

+ References

No definition available.

+ Details

Name:	oak_FairValueOfDebtObligationDecreaseInValueDueToIncreaseInAverageBorrowingRate
Namespace Prefix:	oak_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of debt obligation, increase in value due to decrease in average borrowing rate.

+ References

No definition available.

+ Details

Name:	oak_FairValueOfDebtObligationIncreaseInValueDueToDecreaseInAverageBorrowingRate
Namespace Prefix:	oak_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum required levels of assets under management for credit facilities.

+ References

No definition available.

+ Details

Name:	oak_MinimumRequiredLevelsOfAssetsUnderManagementForCreditFacilities
Namespace Prefix:	oak_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage decrease in average borrowing rate assumption that would increase fair value of debt obligation.

+ References

No definition available.

+ Details

Name:	oak_PercentageDecreaseInAverageBorrowingRateAssumptionThatWouldIncreaseFairValueOfDebtObligation
Namespace Prefix:	oak_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage increase in average borrowing rate assumption that would lower fair value of debt obligation.

+ References

No definition available.

+ Details

Name:	oak_PercentageIncreaseInAverageBorrowingRateAssumptionThatWouldLowerFairValueOfDebtObligation
Namespace Prefix:	oak_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Senior Notes, Term

+ References

No definition available.

+ Details

Name:	oak_SeniorNotesTerm
Namespace Prefix:	oak_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=oak_SeniorUnsecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=oak_SeniorUnsecuredCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=oak_SixPointZeroNinePercentDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=oak_A2.22TermLoanDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=oak_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=oak_A3.69SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=oak_OaktreeCapitalManagementL.P.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=oak_TermLoanVariableRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DEBT OBLIGATIONS AND CREDIT FACILITIES - Additional Information (Detail)		1 Months Ended	6 Months Ended
	Jul. 12, 2016 USD ($)	Mar. 31, 2016	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Debt obligations			$ 800,000,000			$ 850,000,000
Repayment			50,000,000	$ 0
Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Minimum required levels of assets			$ 60,000,000,000
Consolidated Funds \| Senior Notes
Debt Instrument [Line Items]
Term (in years)			10 years
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Leverage ratio			3.0
Unused commitment fee (as a percent)			0.125%
Credit agreement			$ 500,000,000
Senior Unsecured Credit Facilities \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement			500,000,000
Level III
Debt Instrument [Line Items]
Total CLO debt obligations			$ 812,500,000			$ 855,300,000
Average borrowing rate (as a percent)			3.40%			3.70%
Percentage increase in average borrowing rate assumption that would decrease fair value of debt obligation			10.00%
Fair value of debt obligation decrease in value due to increase in average borrowing rate			$ 798,000,000
Percentage decrease in average borrowing rate assumption that would increase fair value of debt obligation			10.00%
Fair value of debt obligation increase in value due to decrease in average borrowing rate			$ 827,600,000
Level III \| Consolidated Funds \| Senior Notes
Debt Instrument [Line Items]
Total CLO debt obligations						$ 3,700,000,000
6.09% Loan Due 2016
Debt Instrument [Line Items]
Debt obligations			0			50,000,000
Face Amount			$ 50,000,000
Stated percentage (as a percent)			6.09%
2.22% Term Loan Due 2021 \| Term Loan
Debt Instrument [Line Items]
Face Amount			$ 250,000,000
Extension period (in years)		1 year
Holding percentage		50.00%
Stated percentage (as a percent)			2.22%
3.69% Senior Notes \| Senior Notes \| Oaktree Capital Management, L.P.
Debt Instrument [Line Items]
Face Amount					$ 100,000,000
Stated percentage (as a percent)					3.69%
Debt term (in years)			15 years
Term Loan, Variable Rate
Debt Instrument [Line Items]
Debt obligations			$ 250,000,000			$ 250,000,000
Face Amount			250,000,000
Term Loan, Variable Rate \| Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Face Amount			$ 250,000,000.0
LIBOR \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Stated percentage (as a percent)			1.00%
Subsequent Event \| Term Loan, Variable Rate
Debt Instrument [Line Items]
Repayment	$ 100,000,000