Annual report pursuant to Section 13 and 15(d)

Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Detail)

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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Contractors [Abstract]    
Costs on uncompleted contracts $ 900,880 $ 743,322
Estimated earnings to date on uncompleted contracts 123,256 95,155
Costs and estimated earnings to date on uncompleted contracts 1,024,136 838,477
Billings to date on uncompleted contracts (1,043,221) (867,881)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ 19,085 $ 29,404