Investment in Storage Facilities and Intangible Assets - Summary of Activity in Storage Facilities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Cost:
Beginning balance	$ 7,090,457
Acquisition of storage facilities	607,856
Improvements and equipment additions	30,274
Net increase in construction in progress	9,279
Dispositions	(3,596)
Ending balance	7,734,270
Accumulated Depreciation:
Beginning balance	1,007,650
Additions during the period	83,436
Dispositions	(2,958)
Ending balance	$ 1,088,128