Summary of Significant Accounting Policies - Revenue Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,062,224	$ 1,060,991	$ 3,182,994	$ 3,164,272
Global Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	64,418	63,380	188,245	164,878
Storage rental
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	673,318	656,973	2,005,580	1,963,561
Storage rental | Global Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	62,001	$ 60,039	182,301	$ 157,479
Operating Segments | Storage Rental, Power and Connectivity | Global Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 12,000		$ 31,000