Annual report pursuant to Section 13 and 15(d)

Supplementary Quarterly Financial Data (Unaudited) - Summary of Quarterly Results of Operations (Detail)

v3.10.0.1
Supplementary Quarterly Financial Data (Unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information [Line Items]                      
Operating revenue $ 138,265 $ 141,483 $ 138,008 $ 133,094 $ 133,078 $ 135,568 $ 132,784 $ 128,320 $ 550,850 $ 529,750 $ 462,608
Net income 92,740 41,311 39,457 34,049 21,185 35,667 19,432 20,525 207,558 96,809 84,956
Net income attributable to common shareholders/unitholders $ 92,307 $ 41,120 $ 39,274 $ 33,889 $ 21,085 $ 35,496 $ 19,355 $ 20,429 $ 206,590 $ 96,365 $ 85,225
Earnings per common share/unit attributable to common shareholders/unitholders - basic $ 1.98 $ 0.88 $ 0.84 $ 0.73 $ 0.45 $ 0.76 $ 0.42 $ 0.44 $ 4.44 $ 2.08 $ 1.97
Earnings per common share/unit attributable to common shareholders/unitholders - diluted $ 1.98 $ 0.88 $ 0.84 $ 0.73 $ 0.45 $ 0.76 $ 0.42 $ 0.44 $ 4.43 $ 2.07 $ 1.96
Life Storage LP [Member]                      
Quarterly Financial Information [Line Items]                      
Operating revenue $ 138,265 $ 141,483 $ 138,008 $ 133,094 $ 133,078 $ 135,568 $ 132,784 $ 128,320 $ 550,850 $ 529,750 $ 462,608
Net income 92,740 41,311 39,457 34,049 21,185 35,667 19,432 20,525 207,558 96,809 84,956
Net income attributable to common shareholders/unitholders $ 92,307 $ 41,120 $ 39,274 $ 33,889 $ 21,085 $ 35,496 $ 19,355 $ 20,429 $ 206,590 $ 96,365 $ 85,225
Earnings per common share/unit attributable to common shareholders/unitholders - basic $ 1.98 $ 0.88 $ 0.84 $ 0.73 $ 0.45 $ 0.76 $ 0.42 $ 0.44 $ 4.44 $ 2.08 $ 1.97
Earnings per common share/unit attributable to common shareholders/unitholders - diluted $ 1.98 $ 0.88 $ 0.84 $ 0.73 $ 0.45 $ 0.76 $ 0.42 $ 0.44 $ 4.43 $ 2.07 $ 1.96