Revenue from Contracts with Customers - Components of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Contract assets
Costs in excess of billings and estimated earnings	$ 47,447	$ 31,894
Retainage receivable	36,416	35,204
Contract assets	83,863	67,098
Change in costs in excess of billings and estimated earnings	15,553
Change in retainage receivable	1,212
Change in total contract assets	16,765
Contract liabilities
Billings in excess of costs and estimated earnings on uncompleted contracts	26,293	46,020
Provisions for losses	419	628
Total contract liabilities	26,712	$ 46,648
Change in billings in excess of costs and estimated earnings	(19,727)
Change in provisions for losses	(209)
Change in total contract liabilities	$ (19,936)