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Intangible Assets - Narrative (Details) - USD ($) $ in Thousands |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2021 | Jan. 22, 2020 | Dec. 31, 2021 | Dec. 31, 2021
PRA Health Sciences, Inc |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired | $ 4,886,000 |  |  |
Amortization of intangible assets |  |  | $ 223,500 |
PRA Health Sciences, Inc | Minimum |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortization period | 3 years |  |  |
PRA Health Sciences, Inc | Maximum |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortization period | 23 years |  |  |
PRA Health Sciences, Inc | Customer relationships |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired | $ 3,915,000 |  |  |
PRA Health Sciences, Inc | Order backlog |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired | 490,000 |  |  |
PRA Health Sciences, Inc | Trade names & brands |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired | 202,000 |  |  |
PRA Health Sciences, Inc | Patient database |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired | 168,000 |  |  |
PRA Health Sciences, Inc | Technology assets |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired | $ 111,000 |  |  |
Medpass Group Limited |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets |  |  |  | $ 2,000
Percentage of share capital acquired (in percent) |  | 100.00% |  |
Medpass Group Limited | Customer relationships |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired |  | $ 11,725 |  |
Amortization period |  | 13 years |  |
Medpass Group Limited | Order backlog |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Value of intangible assets acquired |  | $ 2,883 |  |
Amortization period |  | 3 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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