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Summary of Significant Accounting Policies - Long Lived Assets (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) unit | Jun. 30, 2021 USD ($) unit | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) facility | Sep. 30, 2020 USD ($) facility | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Consolidated gain on disposal/write-down of property, plant and equipment, net | $ 705 |  |  | $ 4,451 |  |  | $ 172,041 | $ 363,537 | $ 63,824
Sale and sale-leaseback transactions |  |  |  |  |  |  | 164,000 | 342,100 | 67,800
Gain on equity investment | $ 35,821 |  |  | $ 0 |  |  |  |  |
(Gain) Loss on disposal/write-down of property, plant and equipment, net |  |  |  |  |  |  |  |  | 36,000
Intangible impairments |  |  |  |  |  |  | $ 0 | 23,000 | 0
5 Facilities In The United States |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Sale and sale-leaseback transactions |  |  | $ 127,400 |  |  |  |  |  |
Number of facilities | unit |  |  | 5 |  |  |  |  |  |
9 Facilities In The United States |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Sale and sale-leaseback transactions |  | $ 36,600 |  |  |  |  |  |  |
Number of facilities | unit |  | 9 |  |  |  |  |  |  |
14 Facilities In The United States |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Sale and sale-leaseback transactions |  |  |  |  | $ 265,600 |  |  |  |
Number of facilities | facility |  |  |  |  | 14 |  |  |  |
2 Facilities In The Unites States |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Sale and sale-leaseback transactions |  |  |  |  |  | $ 76,400 |  |  |
Number of facilities | facility |  |  |  |  |  | 2 |  |  |
Iron Mountain Iron Cloud |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Consolidated gain on disposal/write-down of property, plant and equipment, net |  |  |  |  |  |  |  |  | 25,000
Intangible impairments |  |  |  |  |  |  |  |  | $ 15,700
Frankfurt JV |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain on equity investment |  |  |  |  |  |  |  | $ 24,100 |

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