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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