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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |  |  |  |  |
Average period to securitization |  |  | 30 days |  |  |
MSRs retained | $ 1,400 | $ 3,600 | $ 5,900 | $ 18,600 |  |
Percentage of loan transferred through securitization 60 days or more past due |  |  | 7.40% |  | 8.90% |
Loans held for investment, not pledged as collateral | 78,100 |  | $ 78,100 |  | $ 83,800 |
Pledged advance remittance period |  |  | 2 days |  |  |
Mortgage servicing rights, at fair value | 999,282 | $ 598,147 | $ 999,282 | $ 598,147 | 671,962 | $ 679,256
Advances | 166,024 |  | 166,024 |  | $ 211,793 |
Residential Mortgage-Backed Securitization Trusts [Member] |  |  |  |  |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |  |  |  |  |
Mortgage servicing rights, at fair value | 200 |  | 200 |  |  |
Investment in residual securities of trusts | 1,700 |  | 1,700 |  |  |
Advances | $ 1,200 |  | $ 1,200 |  |  |

X
- Definition Carrying amount as of the balance sheet date of non-interest-bearing advances made on loans serviced for others. Includes receivables for funds advanced by the servicer to meet contractual principal and interest remittance requirements for the investors, pay property taxes and insurance premiums and process foreclosures. Also includes receivables for funds advanced to maintain, repair and market foreclosed real estate properties on behalf of investors. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
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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
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Balance Type: | debit
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X
- Definition Percentage of loan transferred through securitization 60 days or more past due. + References No definition available. + Details
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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
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as available for sale or held for investment which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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X
- 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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X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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X
- Details
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