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REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Pro Forma Information (Details) $ / shares in Units, shares in Thousands		12 Months Ended
	Jan. 01, 2015 property	Dec. 31, 2016 USD ($) property $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)
Real estate acquisition costs		$ 596,000	$ 449,000	$ 479,000
Business acquisition pro forma information:
Pro forma unaudited revenues		74,612,000	73,210,000
Pro forma net income attributable to One Liberty Properties, Inc.		$ 25,620,000	$ 21,571,000
Pro forma weighted average number of common shares outstanding:
Basic (in shares) | shares		16,768	15,971
Diluted (in shares) | shares		16,882	16,079
Pro forma per common share attributable to common stockholders:
Basic (in dollars per share) | $ / shares		$ 1.47	$ 1.23
Diluted (in dollars per share) | $ / shares		$ 1.46	$ 1.23
2016 Acquisitions
Number of real estate properties acquired | property		9
Real estate acquisition costs		$ 582,000
Pro forma per common share attributable to common stockholders:
Revenues already included in the results of operations		4,251,000
Net income already included in the results of operations		$ 654,000
Wheaton, Illinois and Beachwood, Ohio lands
Number of real estate properties acquired | property	2

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The pro forma basic number of weighted average shares for a period as if the business combination or combinations had been completed at the beginning of a period.

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