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Construction Contracts in Progress - Summary of Contracts in Progress (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Summary of Contracts in Progress [Abstract] |  |
Costs incurred on uncompleted contracts | $ 111,925 | $ 94,686
Estimated earnings | 55,527 | 52,246
Earned revenue | 167,452 | 146,932
Less billings to date | (162,427) | (141,478)
Total | 5,025 | 5,454
Classified as follows: |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 6,755 | 7,312
Billings in excess of costs and estimated earnings on uncompleted contracts | $ (1,730) | $ (1,858)

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