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Revenue Recognition - Schedule of Net Under (Over) Billings (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Contractors [Abstract]    
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets) $ 21,871 $ 22,138
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities) (6,343) (5,734)
Net under billings $ 15,528 $ 16,404