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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Contractors [Line Items]
Unbilled revenue, net	$ 108,268		$ 97,543
Contract retainages, net	84,615		88,260
Contract assets, net	192,883		$ 185,803
Changes in contract assets, net, Change	6,991	$ 7,467
Change
Contractors [Line Items]
Unbilled revenue, net, Change	10,725
Contract retainages, net, Change	(3,645)
Changes in contract assets, net, Change	$ 7,080

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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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