Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 4 months 24 days	6 years 1 month 6 days
Weighted average prepayment speed	12.90%	20.90%
Weighted average discount rate	2.70%	3.30%
Loans Held for Investment [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 1 month 6 days	5 years 6 months
Weighted average prepayment speed	5.70%	5.20%
Loans Held for Investment [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 10 months 24 days	8 years 8 months 12 days
Weighted average prepayment speed	53.80%	53.80%
Mortgage Servicing Rights - Amortized Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	9.50%	8.90%
Weighted average delinquency rate	12.00%	11.10%
Advance financing cost	5 years	5 years
Interest rate for computing float earnings	5 years	5 years
Weighted average discount rate	9.20%	8.90%
Weighted average cost to service (in dollars)	99	108
Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	8.80%	8.40%
Weighted average delinquency rate	0.70%	1.00%
Advance financing cost	5 years	5 years
Interest rate for computing float earnings	5 years	5 years
Weighted average discount rate	9.00%	9.00%
Weighted average cost to service (in dollars)	63	64
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	16.50%	16.50%
Weighted average delinquency rate	29.70%	29.30%
Fair value inputs financing costs float earnings, basis spread	0.50%
Fair value input, interest rate	2.75%	3.50%
Weighted average discount rate	12.60%	14.90%
Weighted average cost to service (in dollars)	312	307
HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 4 months 24 days	5 years 1 month 6 days
Weighted average prepayment speed	12.90%	20.90%
Weighted average discount rate	2.60%	2.70%
HMBS - Related Borrowings [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 1 month 6 days	4 years 6 months
Weighted average prepayment speed	5.70%	5.20%
HMBS - Related Borrowings [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 10 months 24 days	8 years 8 months 12 days
Weighted average prepayment speed	53.80%	53.80%
Mortgage Servicing Rights Pledged [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	17.00%	17.00%
Weighted average delinquency rate	30.50%	29.80%
Fair value inputs financing costs float earnings, basis spread	0.50%
Fair value input, interest rate	2.75%	3.50%
Weighted average discount rate	13.30%	14.90%
Weighted average cost to service (in dollars)	320	313
Automotive Dealer Financing Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	2 months 21 days	3 months 7 days
Weighted average discount rate	10.00%	10.00%
Fair value inputs average note rate	8.30%	8.30%
Fair value inputs loan loss rate	19.20%	11.30%
London Interbank Offered Rate (LIBOR) [Member] \| Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Interest rate for computing float earnings	5 years	1 month
London Interbank Offered Rate (LIBOR) [Member] \| Mortgage Servicing Rights Pledged [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Interest rate for computing float earnings	5 years	1 month

Fair value inputs average note rate.

No definition available.

Name:	ocn_FairValueInputsAverageNoteRate
Namespace Prefix:	ocn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the fair value inputs basis spread on advance borrowings.

+ References

No definition available.

+ Details

Name:	ocn_FairValueInputsBasisSpreadOnVariableRate
Namespace Prefix:	ocn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Inputs, Financing Costs, Comparative Derivative Term

+ References

No definition available.

+ Details

Name:	ocn_FairValueInputsFinancingCostsComparativeDerivativeTerm
Namespace Prefix:	ocn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Inputs, Financing Costs, Float Earnings

+ References

No definition available.

+ Details

Name:	ocn_FairValueInputsFinancingCostsFloatEarnings
Namespace Prefix:	ocn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value inputs financing costs float earnings basis spread.

+ References

No definition available.

+ Details

Name:	ocn_FairValueInputsFinancingCostsFloatEarningsBasisSpread
Namespace Prefix:	ocn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value inputs loan loss rate.

+ References

No definition available.

+ Details

Name:	ocn_FairValueInputsLoanLossRate
Namespace Prefix:	ocn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value inputs, weighted average cost to service (in dollars).

+ References

No definition available.

+ Details

Name:	ocn_FairValueInputsWeightedAverageCostToService
Namespace Prefix:	ocn_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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

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

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

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

- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

+ Details

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

- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocn_LoansHeldforInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocn_MortgageServicingRightsAmortizedCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocn_FairValueAgencyMortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocn_FairValueNonAgencyMortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocn_HMBSRelatedBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocn_MortgageServicingRightsPledgedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ocn_AutomotiveDealerFinancingNotesMember
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: