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Intangible assets | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | Intangible assets The carrying amount of Intangible Assets for the periods ended March 31, 2024 and December 31, 2023 is as follows:
| March 31, 2024 | December 31, 2023
| (in thousands)
Cost |  |
Customer relationships | $ | 4,089,517 |  | $ | 4,090,393 |
Order backlog | 540,921 |  | 541,302 |
Trade names & brands | 204,629 |  | 204,653 |
Patient database | 170,345 |  | 170,366 |
Technology assets | 151,000 |  | 141,257 |
Total cost | 5,156,412 |  | 5,147,971 |
Accumulated amortization | (1,407,473) |  | (1,292,106) |
Net book value | $ | 3,748,939 |  | $ | 3,855,865 |
In the three months ended March 31, 2024, the amortization expense recognized by the Company was $116.5 million (year ended December 31, 2023: $459.9 million). On January 9, 2024, the Company acquired HumanFirst. The acquisition resulted in the recognition of a developed technology intangible asset of $9.9 million. Refer to note 5. Goodwill for further details. The identifiable intangible assets are amortized over their estimated useful lives.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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