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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CONSOLIDATED STATEMENTS OF INCOME |  |  |
General and administrative, related parties | $ 2,385 us-gaap_CostsAndExpensesRelatedParty | $ 2,679 us-gaap_CostsAndExpensesRelatedParty | $ 2,679 us-gaap_CostsAndExpensesRelatedParty
Real estate expenses, related party | $ 850 olp_RealEstateCostsAndExpensesRelatedParty | $ 600 olp_RealEstateCostsAndExpensesRelatedParty | $ 600 olp_RealEstateCostsAndExpensesRelatedParty

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- Definition Amount representing the costs and operating expenses for the period related to transactions with the related parties. + References No definition available. + Details
Name: | olp_RealEstateCostsAndExpensesRelatedParty
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_CostsAndExpensesRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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