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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Footnote) (Details) - USD ($) $ in Thousands |  | 3 Months Ended
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Feb. 20, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing transfers and adjustments |  | $ 528 | $ 264,523
New Residential Investment Corp |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing transfers and adjustments | $ 263,700 |  |

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- Definition Amount of increase (decrease) in fair value from changes classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | srt_CounterpartyNameAxis=ocn_NewResidentialInvestmentCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |