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
9 Months Ended
Sep. 30, 2018
USD ($)
Cost:  
Beginning balance $ 4,321,410
Acquisitions of storage facilities 19,172
Improvements and equipment additions 29,911
Net increase in construction in progress 15,393
Dispositions (12,299)
Ending balance 4,373,587
Accumulated Depreciation:  
Beginning balance 624,314
Additions during the period 76,844
Dispositions (3,188)
Ending balance $ 697,970