Quarterly report pursuant to Section 13 or 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
Jun. 30, 2018
Sep. 30, 2017
Contractors [Abstract]    
Costs on uncompleted contracts $ 677,833 $ 489,661
Estimated earnings to date on uncompleted contracts 88,222 62,193
Costs and estimated earnings to date on uncompleted contracts 766,055 551,854
Billings to date on uncompleted contracts (792,828) (579,370)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (26,773) $ (27,516)