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
Mar. 31, 2018
Sep. 30, 2017
Contractors [Abstract]    
Costs on uncompleted contracts $ 545,216 $ 489,661
Estimated earnings to date on uncompleted contracts 68,428 62,193
Costs and estimated earnings to date on uncompleted contracts 613,644 551,854
Billings to date on uncompleted contracts (635,619) (579,370)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (21,975) $ (27,516)