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Summary of Significant Accounting Policies - Customer Relationships and Acquisition Costs and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortizable intangible assets
Net Carrying Amount	$ 1,506,522	$ 1,400,547
Amortization	186,774	116,093	$ 86,800
Amortization Expense Included In Depreciation And Amortization
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years
2019	160,048
2020	155,324
2021	151,546
2022	121,459
2023	118,586
Thereafter	800,248
Customer relationship intangible assets
Amortizable intangible assets
Gross Carrying Amount	1,718,919	1,704,105
Accumulated Amortization	(455,705)	(395,278)
Net Carrying Amount	$ 1,263,214	1,308,827
Customer relationship intangible assets | Minimum
Amortizable intangible assets
Useful life of finite-lived intangible assets	10 years
Customer relationship intangible assets | Maximum
Amortizable intangible assets
Useful life of finite-lived intangible assets	30 years
Customer relationship intangible assets | Weighted Average
Amortizable intangible assets
Useful life of finite-lived intangible assets	18 years
Customer Inducements
Amortizable intangible assets
Useful life of finite-lived intangible assets	3 years
Gross Carrying Amount	$ 56,478	140,030
Accumulated Amortization	(34,181)	(66,981)
Net Carrying Amount	$ 22,297	73,049
Customer Inducements | Minimum
Amortizable intangible assets
Remaining amortization period	10 years
Customer Inducements | Maximum
Amortizable intangible assets
Remaining amortization period	30 years
Customer Relationships Current Record Management Vendor Or Payments To Customers | Weighted Average
Amortizable intangible assets
Useful life of finite-lived intangible assets	7 years
Data center in-place leases | Weighted Average
Amortizable intangible assets
Remaining amortization period	6 years
Data center tenant relationships | Weighted Average
Amortizable intangible assets
Remaining amortization period	9 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers | Minimum
Amortizable intangible assets
Remaining amortization period	5 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers | Maximum
Amortizable intangible assets
Remaining amortization period	15 years
Customer-Related Intangible Assets
Amortizable intangible assets
Amortization	$ 113,782	109,563	84,349
Leases Acquired In Place and Tenant Relationships [Member]
Amortizable intangible assets
Amortization	$ 43,061	0	0
Data Center Above Market Leases | Weighted Average
Amortizable intangible assets
Remaining amortization period	4 years
Data Center Below Market Leases | Weighted Average
Amortizable intangible assets
Remaining amortization period	9 years
Other Intangible Assets
Amortizable intangible assets
Gross Carrying Amount	$ 20,310	20,929
Accumulated Amortization	(14,798)	(10,728)
Net Carrying Amount	5,512	10,201
Amortization	$ 4,624	6,530	2,451
Other Intangible Assets | Weighted Average
Amortizable intangible assets
Useful life of finite-lived intangible assets	4 years
Third-party Commissions Asset
Amortizable intangible assets
Gross Carrying Amount	$ 30,071	0
Accumulated Amortization	(1,089)	0
Net Carrying Amount	28,982	0
Amortization	1,089	0	0
Permanent Withdrawal Fees
Amortizable intangible assets
Amortization	11,408	11,253	12,217
Permanent Withdrawal Fees | Amortization Expense Charged To Revenues
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years
2019	7,386
2020	5,705
2021	3,792
2022	1,667
2023	1,192
Thereafter	1,387
Data Center Above and Below Market Leases
Amortizable intangible assets
Amortization	4,873	0	$ 0
Data Center Above and Below Market Leases | Amortization Expense Charged To Revenues
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years
2019	4,332
2020	1,260
2021	676
2022	157
2023	(523)
Thereafter	(3,902)
Data Center
Amortizable intangible assets
Gross Carrying Amount	271,818	19,314
Accumulated Amortization	(50,807)	(643)
Net Carrying Amount	221,011	18,671
Gross Carrying Amount	12,318	0
Accumulated Amortization	1,642	0
Net Carrying Amount	10,676	0
Customer Relationships, Customer Inducements and Data Center
Amortizable intangible assets
Gross Carrying Amount	2,077,286	1,863,449
Accumulated Amortization	(541,782)	(462,902)
Net Carrying Amount	$ 1,535,504	$ 1,400,547

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