Summary of Significant Accounting Policies - Activity in Real Estate Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating facilities, at cost:
Ending balance	$ 2,575,367
Accumulated depreciation:
Ending balance	(1,118,941)
Total property, plant and equipment and capital leases, net	1,839,701	$ 1,834,885
Total real estate facilities
Operating facilities, at cost:
Beginning balance	2,506,656	2,382,343
Capital expenditures	50,680	52,555
Acquisitions	0	27,958
Newly developed warehouse facilities	62,353	60,598
Disposition	(30,199)	(20,780)
Impairment	(747)	(9,473)
Conversion of leased assets to owned	8,405	0
Impact of foreign exchange rate changes	(21,781)	13,455
Ending balance	2,575,367	2,506,656
Accumulated depreciation:
Beginning balance	(770,006)	(692,390)
Depreciation expense	(87,355)	(86,169)
Capital expenditures	24,672	11,143
Ending balance	4,797	(2,590)
Ending balance	(827,892)	(770,006)
Total property, plant and equipment and capital leases, net	1,747,475	1,736,650
Non-real estate assets
Accumulated depreciation:
Ending balance	(449,024)
Total property, plant and equipment and capital leases, net	$ 92,226	$ 98,235