Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Common Share
Number of shares awarded under Pay-for-Performance program included in diluted weighted average number of shares	100,000	100,000	100,000	100,000
Underlying number of shares awarded under Pay-for-Performance program included in calculation of diluted weighted average number of shares	200,000	200,000	200,000	200,000
Number of shares awarded under Pay-for-Performance program not included in diluted weighted average number of shares	100,000	100,000	100,000	100,000
Numerator for basic and diluted earnings per share:
Income from continuing operations	$ 3,791	$ 2,647	$ 16,712	$ 10,596
Less net income attributable to non-controlling interests	(3)	(27)	(1,386)	(76)
Less earnings allocated to unvested restricted stock	(210)	(178)	(631)	(534)
Income from continuing operations available for common stockholders	3,578	2,442	14,695	9,986
Discontinued operations				13
Net income available for common stockholders, basic	3,578	2,442	14,695	9,999
Net income available for common stockholders, diluted	$ 0	$ 2,442	$ 0	$ 9,999
Denominator for basic earnings per share:
Weighted average common shares	16,014,000	15,650,000	15,892,000	15,508,000
Effect of diluted securities:
Restricted stock units awarded under Pay-for-Performance program (in shares)	100,000	100,000	100,000	100,000
Denominator for diluted earnings per share - weighted average shares	16,114,000	15,750,000	15,992,000	15,608,000
Earnings per common share, basic (in dollars per share)	$ 0.22	$ 0.16	$ 0.92	$ 0.64
Earnings per common share, diluted (in dollars per share)	$ 0.22	$ 0.16	$ 0.92	$ 0.64
Net income attributable to One Liberty Properties, Inc. common stockholders, net of non-controlling interests:
Income from continuing operations	$ 3,788	$ 2,620	$ 15,326	$ 10,520
Income from discontinued operations				13
Net income attributable to One Liberty Properties, Inc.	$ 3,788	$ 2,620	$ 15,326	$ 10,533

Represents the underlying number of shares from which is derived the additional shares to be included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

No definition available.