Quarterly report pursuant to Section 13 or 15(d)

Costs and Estimated Earnings on Uncompleted Contracts - Reconciliation of Net Billings in Excess of Costs and Estimated Earnings to Amounts Reflected on the Company's Consolidated Balance Sheet (Detail)

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Costs and Estimated Earnings on Uncompleted Contracts - Reconciliation of Net Billings in Excess of Costs and Estimated Earnings to Amounts Reflected on the Company's Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Contractors [Abstract]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 10,132 $ 4,592
Billings in excess of costs and estimated earnings on uncompleted contracts (32,107) (32,108)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (21,975) $ (27,516)