v3.26.3
Summary of significant accounting policies (Tables)
9 Months Ended
Sep. 30, 2026
Accounting Policies [Abstract]  
Schedule of estimated useful lives of Intangible Assets amortized on a straight-line basis
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
Technology assets5 years
The carrying amount of intangible assets as of September 30, 2026 and December 31, 2025 is as follows:

September 30,
2026
December 31,
2025
(in thousands)
Cost
Customer relationships$4,114,252 $4,134,478 
Order backlog544,514 546,054 
Trade names & brands189,686 204,721 
Patient database2,463 170,511 
Technology assets116,466 151,754 
Total cost4,967,381 5,207,518 
Accumulated amortization(1,867,115)(1,873,663)
Impairment— (86,737)
 Net book value$3,100,266 $3,247,118