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

Time period in which securitization takes place after loan closing or purchase.

No definition available.

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

This represents the fair value of reverse mortgage loans originated but not securitized and not yet pledged as collateral.

No definition available.

Name:	ocn_FairValueOfLoansHeldForInvestmentNotPledgedAsCollateral
Namespace Prefix:	ocn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Percentage of loan transferred through securitization 60 days or more past due.

No definition available.

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

This represents the time period within which the collected funds related to pledged advances are remitted to trusts.

No definition available.

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

The amount of mortgage servicing rights (MSRs) retained in connection with transfer of securitized loans accounted for as sales.

No definition available.

Name:	ocn_ServicingAssetsatAmortizedCostAdditionsRecognizedfromSecuritizationTrustsRelatedToTransfersAccountedForAsSales
Namespace Prefix:	ocn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

No definition available.

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