Revenue from Contracts with Customers - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contracts in progress
Costs incurred on contracts in progress	$ 3,723,715	$ 3,103,580
Estimated earnings, net of losses	589,286	548,435
Less-Billings to date	(4,527,801)	(3,813,171)
Less-Unbilled accounts receivable	(61,881)	(45,596)
Less-Unbilled accounts receivable credit allowance	(715)	(784)
Contracts in progress	(277,396)	(207,536)
Costs and estimated earnings in excess of billings	29,900	18,622	$ 2,736
Plus-Costs and estimated earnings in excess of billings credit allowance	84	79
Billings in excess of costs and estimated earnings	$ (307,380)	(226,237)	$ (166,918)
Period during which progress billings or contract price can be withheld until completion of work	6 months
Retention receivable	$ 139,500	124,100
Retention payable	$ 24,000	$ 22,200
Revenue, Performance Obligation, Description of Payment Terms	We typically invoice our customers with payment terms of net due in 30 days
Receivable payment terms (in days)	30 days
Minimum
Contracts in progress
Receivable payment terms (in days)	45 days
Payments received term (in days)	30 days
Maximum
Contracts in progress
Receivable payment terms (in days)	60 days
Payments received term (in days)	90 days