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Basis of Preparation (Details)	1 Months Ended	6 Months Ended
	Feb. 29, 2012	Jun. 30, 2012 item
Joint Venture disclosures
Number of joint ventures in which company has controlling interest		2
Ownership percentage in variable interest entity	90.00%
Number of other unconsolidated joint ventures		5
Unconsolidated JV in Plano, Texas
Joint Venture disclosures
Ownership percentage in variable interest entity	90.00%
Consolidated JV one
Joint Venture disclosures
Ownership interest in consolidated joint venture (as a percent)		90.00%
Consolidated JV two
Joint Venture disclosures
Ownership interest in consolidated joint venture (as a percent)		95.00%

X

- Definition

Represents the number of joint ventures in which entity has controlling interest.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of unconsolidated joint ventures of the entity that are not separately disclosed within the note disclosures.

+ References

No definition available.

+ Details

Name:	olp_NumberOfOtherUnconsolidatedJointVentures
Namespace Prefix:	olp_
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X

- Details

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X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685

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