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Revenue Recognition - Schedule of Net Under (Over) Billings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contractors [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets)	$ 22,138	$ 15,092
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities)	(5,734)	(4,426)
Net under billings	$ 16,404	$ 10,666

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