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Property Acquisitions and Dispositions - Additional Information (Details)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 16, 2018
USD ($)
Nov. 30, 2017
USD ($)
store
Sep. 13, 2017
USD ($)
Jul. 26, 2016
USD ($)
Apr. 20, 2016
USD ($)
store
Apr. 01, 2016
USD ($)
shares
Dec. 31, 2014
store
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets                 $ 52,458 $ 312,165 $ 60,813
Acquisition of Stores in New Jersey and Virginia                      
Property Acquisitions [Line Items]                      
Number of stores acquired | store             5        
Increase in payments due to sellers                     $ 4,284
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of California Store                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets $ 40,235                    
Gain (loss) on disposition of assets $ 30,671                    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of 36 Stores Located in Various States                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets   $ 295,000                  
Gain (loss) on disposition of assets   $ 118,776                  
Number of stores sold | store   36                  
Percentage of gain received on disposition   90.00%                  
Percentage of gain deferred on disposition   10.00%                  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of New York Land                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets     $ 19,000                
Gain (loss) on disposition of assets               $ (3,500)      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of Indiana Store                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets       $ 4,447              
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of Ohio and Indiana Stores                      
Property Acquisitions [Line Items]                      
Proceeds from sale of real estate assets, investments in real estate ventures and other assets         $ 17,555            
Gain (loss) on disposition of assets         $ 11,265            
Number of stores sold | store         7            
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Disposal of Texas Store                      
Property Acquisitions [Line Items]                      
Gain (loss) on disposition of assets           $ 93          
OP Units received on disposal (in shares) | shares           85,452          
Value of OP Units received on disposal           $ 7,689          
Storage Portfolio II JV LLC                      
Property Acquisitions [Line Items]                      
Equity ownership %   10.00%             10.00%