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Business Combination (Details 5) - Limbach [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |
Pro forma revenues | $ 446,994 | $ 331,350
Pro forma net income (loss) attributable to common shareholders | $ (568) | $ (3,966)

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