Quarterly report pursuant to Section 13 or 15(d)

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

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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]    
Costs on uncompleted contracts $ 997,238 $ 900,880
Estimated earnings to date on uncompleted contracts 131,978 123,256
Costs and estimated earnings to date on uncompleted contracts 1,129,216 1,024,136
Billings to date on uncompleted contracts (1,146,233) (1,043,221)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (17,017) $ (19,085)