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Basis of Preparation (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2014 item	Mar. 31, 2014 item	Dec. 31, 2013 item
Investment in Joint Ventures
Number of unconsolidated joint ventures		5	5
Reclassification
Number of properties sold and reclassified to discontinued operations	2
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 properties classified as transferred assets and liabilities in prior year period and sold in the current period to be re-classified as properties held-for-sale as of end of last year period.

+ References

No definition available.

+ Details

Name:	olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale
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:	olp_ReclassificationAbstract
Namespace Prefix:	olp_
Data Type:	xbrli:stringItemType
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