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Summary Accounting Policies - Investment in Joint Ventures and Variable Interest Entities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($)
Investment in Joint Ventures and Variable Interest Entities |  |  |  |
Number of Unconsolidated Joint Venture VIEs | item |  |  | 0 |
Recourse debt of joint venture | $ 0 |  | $ 0 |
Impairment charge relating to investments in unconsolidated joint ventures | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition Amount of debt for which the creditor has general recourse to the joint venture debtor. + References No definition available. + Details
Name: | olp_JointVentureRecourseDebt
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of unconsolidated joint venture investments that are classified as a Variable Interest Entity (VIE). + References No definition available. + Details
Name: | olp_UnconsolidatedJointVentureVariableInterestEntityNumberOfEntities
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
Name: | us-gaap_ImpairmentOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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