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SIGNIFICANT ACCOUNTING POLICIES (Details 6) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Feb. 28, 2014 property | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  |  |  |  |  |  | 1 us-gaap_NumberOfOperatingSegments |  |
Earnings Per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Number of shares awarded under Pay-for-Performance program included in diluted weighted average number of shares |  |  |  |  |  |  |  |  |  | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Underlying number of shares awarded under Pay-for-Performance program included in calculation of diluted weighted average number of shares |  |  |  |  |  |  |  |  |  | 200,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares | 200,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares | 200,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares
Underlying number of shares awarded under Pay-for-Performance program included in calculation of diluted weighted average number of restricted stock units |  |  |  |  |  |  |  |  |  | 100,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingRestrictedStockUnits | 100,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingRestrictedStockUnits | 100,000 olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingRestrictedStockUnits
Number of shares awarded under Pay-for-Performance program not included in diluted weighted average number of shares |  |  |  |  |  |  |  |  |  | 100,000 olp_IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare | 100,000 olp_IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare | 100,000 olp_IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare
Outstanding options at the end of the period (in shares) |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ 11,601 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 2,647 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 4,662 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,287 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,405 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,084 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 7,607 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,313 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 22,197 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 17,409 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 11,328 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Less net (income) loss attributable to non-controlling interests |  |  |  |  |  |  |  |  |  | (94)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (49)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 12 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Less earnings allocated to unvested shares |  |  |  |  |  |  |  |  |  | (722)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (667)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic |
Income from continuing operations available for common stockholders |  |  |  |  |  |  |  |  |  | 21,381 olp_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders | 16,693 olp_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders | 11,340 olp_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders
Discontinued operations |  |  |  |  | 13 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 90 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 144 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 145 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 136 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 13 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 515 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 20,980 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income available for common stockholders, basic and diluted |  |  |  |  |  |  |  |  |  | 21,394 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 17,208 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 32,320 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income available for common stockholders, diluted |  |  |  |  |  |  |  |  |  | 21,394 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 17,208 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 32,320 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares |  | 15,727,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,650,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,518,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,356,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,178,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,093,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,844,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,672,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,563,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,948,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,427,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average unvested shares of restricted stock |  |  |  |  |  |  |  |  |  |  |  | 411,000 us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights
Denominator for basic earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 15,563,000 olp_WeightedAverageNumberOfSharesOutstandingIncludingUnvestedRestrictedStockSharesBasic | 14,948,000 olp_WeightedAverageNumberOfSharesOutstandingIncludingUnvestedRestrictedStockSharesBasic | 14,838,000 olp_WeightedAverageNumberOfSharesOutstandingIncludingUnvestedRestrictedStockSharesBasic
Effect of diluted securities: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units awarded under Pay-for-Performance program (in shares) |  |  |  |  |  |  |  |  |  | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 100,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted earnings per share - weighted average shares |  |  |  |  |  |  |  |  |  | 15,663,000 olp_WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding | 15,048,000 olp_WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding | 14,938,000 olp_WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding
Earnings per common share, basic (in dollars per share) |  | $ 0.71 us-gaap_EarningsPerShareBasic | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 1.37 us-gaap_EarningsPerShareBasic | $ 1.15 us-gaap_EarningsPerShareBasic | $ 2.18 us-gaap_EarningsPerShareBasic
Earnings per common share, diluted (in dollars per share) |  | $ 0.71 us-gaap_EarningsPerShareDiluted | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 1.37 us-gaap_EarningsPerShareDiluted | $ 1.14 us-gaap_EarningsPerShareDiluted | $ 2.16 us-gaap_EarningsPerShareDiluted
Amounts attributable to One Liberty Properties, Inc. common stockholders, net of non-controlling interests: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  |  | 22,103 us-gaap_IncomeLossFromContinuingOperations | 17,360 us-gaap_IncomeLossFromContinuingOperations | 11,340 us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 13 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 515 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 20,980 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income attributable to One Liberty Properties, Inc. |  | $ 11,583 us-gaap_NetIncomeLoss | $ 2,620 us-gaap_NetIncomeLoss | $ 4,640 us-gaap_NetIncomeLoss | $ 3,273 us-gaap_NetIncomeLoss | $ 3,478 us-gaap_NetIncomeLoss | $ 3,211 us-gaap_NetIncomeLoss | $ 7,736 us-gaap_NetIncomeLoss | $ 3,450 us-gaap_NetIncomeLoss | $ 22,116 us-gaap_NetIncomeLoss | $ 17,875 us-gaap_NetIncomeLoss | $ 32,320 us-gaap_NetIncomeLoss
Reclassification |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold, considered for reclassification | 2 olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of diluted shares outstanding used for the denominator in calculating EPS, which includes the weighted average common shares outstanding and restricted stock units awarded under the Pay for Performance program if certain performance criteria has been met. It also includes the weighted average of unvested restricted stock shares when earnings are in excess of distributions for the period. + References No definition available. + Details
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- Definition Number of basic shares outstanding used for the denominator in calculating EPS, which includes the weighted average common shares outstanding. It also includes the weighted average of unvested restricted stock shares when earnings are in excess of distributions for the period. + References No definition available. + Details
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