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v3.23.1

Summary of significant accounting policies (Tables) | 3 Months Ended
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Mar. 31, 2023
Accounting Policies [Abstract] |
Schedule of Finite-Lived Intangible Assets | Intangible assets are amortized on a straight-line basis over the expected useful life, as set forth in the table below:
| Estimated Useful Life
Customer relationships | 23 years
Order backlog | 3 years
Trade names | 3 years
Patient database | 7 years
Technology assets | 5 years
Intangible assets, net consisted of the following:
| Three Months Ended | Year Ended
| March 31, 2023 | December 31, 2022
Cost | (in thousands)
Customer relationships | $ | 4,077,267 |  | $ | 4,076,435 |
Order backlog | 537,247 |  | 536,934 |
Trade names & brands | 204,640 |  | 204,621 |
Patient database | 170,298 |  | 170,238 |
Technology assets | 121,141 |  | 120,984 |
Total cost | 5,110,593 |  | 5,109,212 |
Accumulated amortization | (946,183) |  | (830,553) |
Net book value | $ | 4,164,410 |  | $ | 4,278,659 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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