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Summary of Significant Accounting Policies - Supplemental Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |  |
Operating cash flows used in operating leases | $ 101,605 | $ 93,645 | $ 392,987 | $ 360,088 | $ 338,059
Operating cash flows used in financing leases (interest) | 4,678 | 4,975 | 19,808 | 19,942 | 21,031
Financing cash flows used in financing leases | 10,362 | 12,441 | 46,118 | 47,829 | 58,033
Operating lease modifications and reassessments | 23,767 | 31,994 | 144,310 | 143,382 | 108,023
New operating leases (including acquisitions and sale-leaseback transactions) | $ 125,902 | $ 48,200 | $ 282,490 | $ 370,011 | $ 170,464

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