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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Contractors [Line Items]
Unbilled revenue, net	$ 140,242		$ 134,187
Contract retainages, net	103,412		90,888
Contract assets, net	243,654		$ 225,075
Changes in contract assets, net, Change	5,745	$ 6,991
Change
Contractors [Line Items]
Unbilled revenue, net, Change	6,055
Contract retainages, net, Change	12,524
Changes in contract assets, net, Change	$ 18,579

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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.

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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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