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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Transfers and Servicing [Abstract] |  |  |
Average period to securitization | 30 days |  |
MSRs retained | $ 2.4 | $ 8.1 |
Percentage of loan transferred through securitization 60 days or more past due | 7.80% |  | 8.90%
Loans held for investment, not pledged as collateral | $ 121.6 |  | $ 83.8
Pledged advance remittance period | 2 days |  |

X
- Definition Time period in which securitization takes place after loan closing or purchase. + References No definition available. + Details
Name: | ocn_AveragePeriodtoSecuritization
Namespace Prefix: | ocn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This represents the fair value of reverse mortgage loans originated but not securitized and not yet pledged as collateral. + References No definition available. + Details
Name: | ocn_FairValueOfLoansHeldForInvestmentNotPledgedAsCollateral
Namespace Prefix: | ocn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of loan transferred through securitization 60 days or more past due. + References No definition available. + Details
Name: | ocn_PercentageOfLoanTransferredThroughSecuritizationSixtyDaysOrMorePastDue
Namespace Prefix: | ocn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This represents the time period within which the collected funds related to pledged advances are remitted to trusts. + References No definition available. + Details
Name: | ocn_PledgedAdvanceRemittancePeriod
Namespace Prefix: | ocn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of mortgage servicing rights (MSRs) retained in connection with transfer of securitized loans accounted for as sales. + References No definition available. + Details
Name: | ocn_ServicingAssetsatAmortizedCostAdditionsRecognizedfromSecuritizationTrustsRelatedToTransfersAccountedForAsSales
Namespace Prefix: | ocn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TransfersAndServicingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration