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Accounts receivable, unbilled revenue (contract assets) and unearned revenue or payments on account (contract liabilities) - Schedule of Unbilled Services and Unearned Revenue or Payments on Account (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Unbilled services (unbilled revenue)	$ 1,258,706	$ 1,286,274
Change in unbilled services (unbilled revenue)	$ (27,568)
Percentage change in unbilled services (unbilled revenue)	(2.10%)
Unearned revenue (payments on account)	$ (1,528,343)	(1,614,758)
Change in unearned revenue (payments on account)	$ 86,415
Percentage change in unearned revenue (payments on account)	(5.40%)
Net balance	$ (269,637)	$ (328,484)
Change in net balance	$ 58,847
Percentage change in net balance	(17.90%)

X

- Definition

Advance Payments Netted Against Unbilled Contracts Receivable

+ References

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- Definition

Change In Advance Payments Netted Against Unbilled Contracts Receivable

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- Definition

Change In Advance Payments Netted Against Unbilled Contracts Receivable, Percent

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- Definition

Increase (Decrease) In Contract With Customer, Asset, Gross, Current

+ References

No definition available.

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- Definition

Increase (Decrease) In Contract With Customer, Asset, Gross, Current, Percent

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- Definition

Increase (Decrease) In Contract With Customer, Liability, Gross, Current

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- Definition

Increase (Decrease) In Contract with Customer, Liability, Gross, Current, Percent

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- Definition

Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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