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Contract Assets and Liabilities - Summary of contract assets and liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Contractors [Line Items]
Contract assets, net	$ 243,654		$ 225,075
Contract liabilities	(165,127)		(167,931)
Net contract assets (liabilities)	78,527		$ 57,144
Contract assets, net, Change	5,745	$ 6,991
Change
Contractors [Line Items]
Contract assets, net, Change	18,579
Contract liabilities, Change	2,804
Net contract assets (liabilities), Change	$ 21,383

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- Definition

The amount of increase (decrease) in net contract assets (liabilities) during the year.

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The amount of net contract assets (liabilities) as at balance sheet period.

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

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