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Discontinued Operations - Additional Information (Detail) - M&I Electric US Operations - Discontinued Operations, Disposed of by Sale - USD ($) |  | 3 Months Ended
--- | --- | ---
Aug. 12, 2018 | Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Total purchase price | $ 18,500,000 |
Cash consideration | 10,100,000 |
Assumed indebtedness | 8,400,000 |
Escrow deposit | $ 740,000 |
Period of escrow deposit secured for certain indemnification obligations | 6 months |
Decrease in net working capital |  | $ (4,300,000)
Senior Secured Term Note |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Repayment of note and related accrued interest | $ 6,500,000 |

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