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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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