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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total cost | $ 5,081,381 | $ 200,011
Accumulated amortization | (370,538) | (133,551)
Net book value | 4,710,843 | 66,460
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total cost | 4,056,642 | 144,251
Order backlog |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total cost | 528,022 | 39,269
Trade names & brands |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total cost | 204,685 | 2,766
Patient database |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total cost | 170,525 | 2,552
Technology assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total cost | $ 121,507 | $ 11,173

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