Annual report pursuant to Section 13 and 15(d)

Costs and Estimated Earnings on Uncompleted Contracts - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Detail)

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Costs and Estimated Earnings on Uncompleted Contracts - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Contractors [Abstract]    
Costs on uncompleted contracts $ 743,322 $ 489,661
Estimated earnings to date on uncompleted contracts 95,155 62,193
Costs and estimated earnings to date on uncompleted contracts 838,477 551,854
Billings to date on uncompleted contracts (867,881) (579,370)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (29,404) $ (27,516)