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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Contractors [Line Items]
Unbilled revenue, net	$ 105,727		$ 97,543
Contract retainages, net	91,146		88,260
Contract assets, net	196,873		$ 185,803
Changes in contract assets, net, Change	10,855	$ 7,658
Change
Contractors [Line Items]
Unbilled revenue, net, Change	8,184
Contract retainages, net, Change	2,886
Changes in contract assets, net, Change	$ 11,070

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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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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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