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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Contractors [Line Items]
Unbilled revenue, net	$ 177,725		$ 156,266
Contract retainages, net	154,791		144,349
Contract assets, net	332,516		$ 300,615
Changes in contract assets, net, Change	31,868	$ 5,745
Change
Contractors [Line Items]
Unbilled revenue, net, Change	21,459
Contract retainages, net, Change	10,442
Changes in contract assets, net, Change	$ 31,901

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The increase (decrease) during the reporting period of the amount of contract receivable retainage.

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The amount of contract with customer, increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts.

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Amount of right to consideration in exchange for good or service transferred to customer withheld under retainage provision in long-term contract or program when right to consideration is unconditional.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount, after 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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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