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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract] |  |  |
Costs incurred on uncompleted contracts | $ 193,393 | $ 174,168 |
Estimated earnings | 76,693 | 67,427 |
Total costs and estimated earnings on uncompleted contracts, gross | 270,086 | 241,595 |
Less billings to date | (261,981) | (232,045) |
Total costs and estimated earnings on uncompleted contracts, net | 8,105 |  | $ 9,550
Included in the accompanying condensed consolidated balance sheets under the following captions: |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 31,701 | 29,694 | 29,694
Billings in excess of costs and estimated earnings on uncompleted contracts | (23,596) | $ (20,144) | (20,144)
Total costs and estimated earnings on uncompleted contracts, net | $ 8,105 |  | $ 9,550

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