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Real Estate Acquisitions - Pro forma information (Details) $ / shares in Units, shares in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2015 property | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) property $ / shares shares | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares
Real estate acquisition costs |  | $ 162,000 | $ 90,000 | $ 610,000 | $ 417,000 |
Business acquisition pro forma information: |  |  |  |  |  |
Pro forma unaudited revenues |  |  |  | 55,519,000 |  | $ 73,037,000
Pro forma net income attributable to One Liberty Properties, Inc. |  |  |  | $ 21,128,000 |  | $ 20,560,000
Pro forma weighted average number of common shares outstanding: |  |  |  |  |  |
Basic (in shares) | shares |  |  |  | 16,605 |  | 15,971
Diluted (in shares) | shares |  |  |  | 16,722 |  | 16,079
Pro forma per common share attributable to common stockholders: |  |  |  |  |  |
Basic (in dollars per share) | $ / shares |  |  |  | $ 1.23 |  | $ 1.23
Diluted (in dollars per share) | $ / shares |  |  |  | $ 1.22 |  | $ 1.23
2016 Acquisitions |  |  |  |  |  |
Number of real estate properties acquired | property |  |  |  | 9 |  |
Real estate acquisition costs |  |  |  | $ 596,000 |  |
Business acquisition pro forma information: |  |  |  |  |  |
Revenues already included in the results of operations |  |  |  | 2,111,000 |  |
Net income already included in the results of operations |  |  |  | 136,000 |  |
Wheaton, Illinois and Beachwood, Ohio lands |  |  |  |  |  |
Number of real estate properties acquired | property | 2 |  |  |  |  |
Business acquisition pro forma information: |  |  |  |  |  |
Pro forma unaudited revenues |  |  |  | 2,024,000 |  | $ 2,700,000
Pro forma unaudited net income |  |  |  | 1,786,000 |  | $ 2,344,000
Revenues already included in the results of operations |  |  |  | 386,000 |  |
Net income already included in the results of operations |  |  |  | $ 386,000 |  |

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- Definition 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. + References No definition available. + Details
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