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Revenue Recognition - Schedule of Net Under (Over) Billings (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Contractors [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets)	$ 24,334	$ 22,138
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities)	(4,718)	(5,734)
Net under billings	$ 19,616	$ 16,404

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