Annual report pursuant to Section 13 and 15(d)

Investment in Storage Facilities and Intangible Assets - Summary of Activity in Storage Facilities (Detail)

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Investment in Storage Facilities and Intangible Assets - Summary of Activity in Storage Facilities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cost:    
Beginning balance $ 5,330,323 $ 4,749,473
Acquisition of storage facilities 1,675,366 523,922
Improvements and equipment additions 59,569 67,069
Net (decrease) increase in construction in progress 25,946 (9,632)
Dispositions (747) (509)
Ending balance 7,090,457 5,330,323
Accumulated Depreciation:    
Beginning balance 873,178 756,333
Additions during the year 134,773 117,168
Dispositions (301) (323)
Ending balance $ 1,007,650 $ 873,178