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Acquisitions - Narrative (Details)
€ in Thousands
3 Months Ended 12 Months Ended
Sep. 23, 2021
USD ($)
Sep. 23, 2021
EUR (€)
Sep. 15, 2021
USD ($)
Feb. 17, 2020
USD ($)
Jan. 09, 2020
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
company
Jan. 08, 2020
Business Acquisition [Line Items]                      
Gain on equity investment           $ 35,821,000 $ 0        
OSG Investment                      
Business Acquisition [Line Items]                      
Ownership percentage                     25.00%
Gain on equity investment               $ 10,000,000      
InfoFort                      
Business Acquisition [Line Items]                      
Cash consideration     $ 90,300,000                
Frankfurt Data Center                      
Business Acquisition [Line Items]                      
Cash consideration $ 91,300,000 € 77,900                  
Records Management Company                      
Business Acquisition [Line Items]                      
Number of companies acquired                 2    
Art Storage Company                      
Business Acquisition [Line Items]                      
Number of companies acquired                 1 1  
Records Management Companies And Art Storage Company                      
Business Acquisition [Line Items]                      
Cash consideration                 $ 45,100,000    
OSG Acquisition                      
Business Acquisition [Line Items]                      
Cash consideration         $ 95,500,000            
Ownership acquired         75.00%            
Storage, Records Management And Art Storage Companies                      
Business Acquisition [Line Items]                      
Cash consideration       $ 29,100,000           $ 51,000,000  
Storage, Records Management And Art Storage Companies | Minimum                      
Business Acquisition [Line Items]                      
Purchase price                   700,000  
Storage, Records Management And Art Storage Companies | Maximum                      
Business Acquisition [Line Items]                      
Purchase price                   $ 12,500,000  
Storage and Data Management Company                      
Business Acquisition [Line Items]                      
Number of companies acquired | company                   10