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Revenue Recognition - Schedule of Net Under (Over) Billings (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
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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Cost and estimated earnings under or over billings net.

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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.

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- Definition

Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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