Revenue Recognition - Schedule of Net Under (Over) Billings (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Contractors [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets)	$ 22,954	$ 22,138
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities)	(5,872)	(5,734)
Net under billings	$ 17,082	$ 16,404