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Summary of significant accounting policies (Tables) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Schedule of Finite-Lived Intangible Assets | Intangible assets are amortized on a straight-line basis over their estimated useful lives, as set forth in the table below:
| Estimated Useful Life
Customer relationships | 8 - 23 years
Order backlog | 3 - 5 years
Patient database | 7 years
Technology assets | 5 years
The carrying amount of Intangible Assets as of September 30, 2025 and December 31, 2024 is as follows:
| September 30, 2025 | December 31, 2024
| (in thousands)
Cost |  |
Customer relationships | $ | 4,134,107 |  | $ | 4,129,501 |
Order backlog | 545,922 |  | 543,933 |
Trade names & brands | 204,713 |  | 204,588 |
Patient database | 170,487 |  | 170,324 |
Technology assets | 151,691 |  | 150,658 |
Total cost | 5,206,920 |  | 5,199,004 |
Accumulated amortization | (1,822,598) |  | (1,639,212) |
Net book value | $ | 3,384,322 |  | $ | 3,559,792 |

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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://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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