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SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
--- | ---
Dec. 31, 2013 item | Dec. 31, 2012 item
Investment in Joint Ventures |  |
Number of unconsolidated joint ventures | 5 | 7
Consolidated JV |  |
Investment in Joint Ventures |  |
Number of joint ventures with controlling interest | 5 |
Consolidated JV | Minimum |  |
Investment in Joint Ventures |  |
Ownership interest in consolidated joint venture (as a percent) | 85.00% |
Consolidated JV | Maximum |  |
Investment in Joint Ventures |  |
Ownership interest in consolidated joint venture (as a percent) | 95.00% |
Unconsolidated JV |  |
Investment in Joint Ventures |  |
Number of unconsolidated joint ventures | 5 |

X
- Definition Represents the number of joint ventures in which entity has controlling interest. + References No definition available. + Details
Name: | olp_NumberOfControllingInterestJointVentures
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of unconsolidated joint ventures of the entity that are accounted for under the equity method of accounting. + References No definition available. + Details
Name: | olp_NumberOfUnconsolidatedJointVentures
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant