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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 22,210us-gaap_ProfitLoss	$ 17,924us-gaap_ProfitLoss	$ 32,308us-gaap_ProfitLoss
Other comprehensive (loss) gain
Net unrealized (loss) gain on available-for-sale securities	(121)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	47us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	11us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net unrealized (loss) gain on derivative instruments	(2,643)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	961us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	(547)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
One Liberty Property's share of joint venture net unrealized gain (loss) on derivative instruments	24olp_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTaxTheCompanyShareFromJointVenture	76olp_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTaxTheCompanyShareFromJointVenture	(23)olp_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTaxTheCompanyShareFromJointVenture
Other comprehensive (loss) gain	(2,740)us-gaap_OtherComprehensiveIncomeLossNetOfTax	1,084us-gaap_OtherComprehensiveIncomeLossNetOfTax	(559)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	19,470us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	19,008us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	31,749us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive (income) loss attributable to non-controlling interests	(94)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(49)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	12us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Unrealized loss on derivative instruments attributable to non-controlling interests	(35)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToNoncontrollingInterest	(4)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToNoncontrollingInterest
Comprehensive income attributable to One Liberty Properties, Inc.	$ 19,341us-gaap_ComprehensiveIncomeNetOfTax	$ 18,955us-gaap_ComprehensiveIncomeNetOfTax	$ 31,761us-gaap_ComprehensiveIncomeNetOfTax

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This element represents the change in accumulated gains and losses from derivative instrument related to share of joint venture, designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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