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Revenue Recognition - Schedule of Net Under (Over) Billings (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Contractors [Abstract] |  |
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets) | $ 17,229 | $ 14,476
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities) | (5,169) | (5,057)
Net under (over) billings | $ 12,060 | $ 9,419

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. + References No definition available. + Details
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