Summary of Significant Accounting Policies - Activity in Real Estate Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating facilities, at cost:
Ending balance	$ 3,729,589
Accumulated depreciation:
Depreciation expense	(153,900)	$ (116,000)	$ (115,100)
Ending balance	(1,246,250)
Total property, buildings and equipment and finance leases, net	2,991,002	1,839,701
Total real estate facilities
Operating facilities, at cost:
Beginning balance	2,575,367	2,506,656
Capital expenditures	177,268	50,680
Acquisitions	975,045	0
Newly developed warehouse facilities	21,316	62,353
Disposition	(7,409)	(30,199)
Impairment	(12,555)	(747)
Conversion of leased assets to owned	0	8,405
Impact of foreign exchange rate changes	557	(21,781)
Ending balance	3,729,589	2,575,367	2,506,656
Accumulated depreciation:
Beginning balance	(827,892)	(770,006)
Depreciation expense	(114,512)	(87,355)
Capital expenditures	6,679	24,672
Impact of foreign exchange rate changes	(697)	4,797
Ending balance	(936,422)	(827,892)	$ (770,006)
Total property, buildings and equipment and finance leases, net	2,793,167	1,747,475
Non-real estate assets
Accumulated depreciation:
Ending balance	(493,539)
Total property, buildings and equipment and finance leases, net	$ 197,835	$ 92,226