Quarterly report pursuant to Section 13 or 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)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Cost:  
Beginning balance $ 4,398,939
Acquisition of storage facilities 66,086
Improvements and equipment additions 10,937
Net increase in construction in progress 996
Dispositions (1,802)
Ending balance 4,475,156
Accumulated Depreciation:  
Beginning balance 704,681
Additions during the period 25,851
Dispositions (1,236)
Ending balance $ 729,296