Summary of Significant Accounting Policies - Activity in Real Estate Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating facilities, at cost:
Ending balance	$ 5,706,760
Accumulated depreciation:
Depreciation expense	(198,800)	$ (153,900)	$ (116,000)
Ending balance	(1,423,235)
Total property, buildings and equipment and finance leases, net	4,922,050	2,991,002
Total real estate facilities
Operating facilities, at cost:
Beginning balance	3,729,589	2,575,367
Capital expenditures	287,220	177,268
Acquisitions	1,662,650	975,045
Newly developed warehouse facilities	58,807	21,316
Disposition	(62,225)	(7,409)
Impairment	(2,153)	(12,555)
Conversion of leased assets to owned	7,956	0
Impact of foreign exchange rate changes	24,916	557
Ending balance	5,706,760	3,729,589	2,575,367
Accumulated depreciation:
Beginning balance	(936,422)	(827,892)
Depreciation expense	(146,237)	(114,512)
Capital expenditures	8,731	6,679
Impact of foreign exchange rate changes	(6,994)	(697)
Ending balance	(1,080,922)	(936,422)	$ (827,892)
Total property, buildings and equipment and finance leases, net	4,625,838	2,793,167
Non-real estate assets
Accumulated depreciation:
Ending balance	(565,423)
Total property, buildings and equipment and finance leases, net	$ 296,212	$ 197,835