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Summary of significant accounting policies (Tables)

9 Months Ended

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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- References

No definition available.

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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

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