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Acquisitions - Narrative (Details) $ in Thousands		1 Months Ended	6 Months Ended
	Jan. 10, 2018 USD ($)	Feb. 28, 2019 USD ($)	Jun. 30, 2019 USD ($) company
Storage and Data Management Company
Business Acquisition [Line Items]
Number of businesses acquired | company			6
Art Storage Company
Business Acquisition [Line Items]
Number of businesses acquired | company			1
Storage, Records Management and Art Storage Companies
Business Acquisition [Line Items]
Cash consideration			$ 36,800
IO Data Center LLC
Business Acquisition [Line Items]
Consideration transferred	$ 1,347,000	$ 31,000
Business combination separately recognized transactions expenses and losses recognized, acquisition costs incurred to date			$ 28,064

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