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Summary of Significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Adjustments resulting from foreign currency translations Amounts charged or credited to the Consolidated Statements of Operations for the years ended December 31, 2024, December 31, 2023 and December 31, 2022 were as follows:
Year ended
 December 31, 2024December 31, 2023December 31, 2022
(in thousands)
Amounts (credited) / charged$(18,085)$12,916 $(25,997)
Estimated useful lives of assets Depreciation of property, plant and equipment is computed using the straight line method based on the estimated useful lives of the assets as listed below: 
Estimated Useful Life
Buildings  40 years
Computer equipment and software
2 - 8 years
Office furniture and fixtures8 years
Laboratory equipment  5 years
Motor vehicles5 years
Schedule of Finite-Lived Intangible Assets
Estimated Useful Life
Customer relationships
8 - 23 years
Order backlog
       3 - 5 years
Trade names3 years
Patient database7 years
Technology assets5 years
The carrying amount of Intangible Assets for the years ended December 31, 2024 and 2023 is as follows:
December 31, 2024December 31, 2023
Cost(in thousands)
Customer relationships$4,129,501 $4,090,393 
Order backlog543,933 541,302 
Trade names & brands204,588 204,653 
Patient database170,324 170,366 
Technology assets150,658 141,257 
Total cost5,199,004 5,147,971 
Accumulated amortization(1,639,212)(1,292,106)
Net book value$3,559,792 $3,855,865