Annual report pursuant to Section 13 and 15(d)

Earnings Per Share and Earnings Per Unit - Computation of Basic and Diluted Earnings Per Common Share/Unit (Detail)

v3.22.0.1
Earnings Per Share and Earnings Per Unit - Computation of Basic and Diluted Earnings Per Common Share/Unit (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:                      
Net income attributable to common shareholders/unitholders $ 74,145 $ 70,274 $ 57,516 $ 47,383 $ 41,586 $ 37,095 $ 36,457 $ 36,433 $ 249,317 $ 151,571 $ 258,699
Denominator:                      
Denominator for basic earnings per share/unit - weighted average shares/units                 78,425 71,055 69,876
Effect of Dilutive Securities:                      
Stock options and non-vested stock                 183 123 104
Denominator for diluted earnings per share/unit - adjusted weighted average shares/units and assumed conversion                 78,608 71,178 69,980
Basic Earnings per common share/unit attributable to common shareholders/unitholders $ 0.90 $ 0.89 $ 0.75 $ 0.63 $ 0.57 $ 0.52 $ 0.52 $ 0.52 $ 3.18 $ 2.13 $ 3.70
Diluted Earnings per common share/unit attributable to common shareholders/unitholders $ 0.90 $ 0.89 $ 0.74 $ 0.63 $ 0.57 $ 0.52 $ 0.52 $ 0.52 $ 3.17 $ 2.13 $ 3.70
Life Storage LP [Member]                      
Numerator:                      
Net income attributable to common shareholders/unitholders $ 74,145 $ 70,274 $ 57,516 $ 47,383 $ 41,586 $ 37,095 $ 36,457 $ 36,433 $ 249,317 $ 151,571 $ 258,699
Denominator:                      
Denominator for basic earnings per share/unit - weighted average shares/units                 78,425 71,055 69,876
Effect of Dilutive Securities:                      
Stock options and non-vested stock                 183 123 104
Denominator for diluted earnings per share/unit - adjusted weighted average shares/units and assumed conversion                 78,608 71,178 69,980
Basic Earnings per common share/unit attributable to common shareholders/unitholders $ 0.90 $ 0.89 $ 0.75 $ 0.63 $ 0.57 $ 0.52 $ 0.52 $ 0.52 $ 3.18 $ 2.13 $ 3.70
Diluted Earnings per common share/unit attributable to common shareholders/unitholders $ 0.90 $ 0.89 $ 0.74 $ 0.63 $ 0.57 $ 0.52 $ 0.52 $ 0.52 $ 3.17 $ 2.13 $ 3.70