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Costs, Estimated Earnings, and Related Billings on Uncompleted Contracts - Contracts in Progress (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Contractors [Abstract] |  |
Costs incurred on uncompleted contracts | $ 32,488 | $ 26,340
Estimated earnings | 6,172 | 1,193
Total cost and earnings of unbilled contracts | 38,660 | 27,533
Billings on uncompleted contracts | (34,018) | (21,912)
Total Costs, estimated earnings, and related billing on uncompleted contracts | $ 4,642 | $ 5,621

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- Definition Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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