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Segment Information - Net Revenue Classified by Country (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue before reimbursements (net revenue)	$ 1,098,573	$ 1,026,864	$ 1,073,464
Unites States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue before reimbursements (net revenue)	647,565	602,574	703,657
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue before reimbursements (net revenue)	115,439	103,183	32,756
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue before reimbursements (net revenue)	$ 335,569	$ 321,107	$ 337,051

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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