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Subsequent Event - Additional Information (Detail) - USD ($) $ in Thousands	Aug. 12, 2018	Aug. 06, 2018	Jun. 30, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Total liabilities of the assets sold			$ 13,710	$ 13,558
M&I Electric US Operations | Subsequent Event | Discontinued operations, Asset held-for-sale
Subsequent Event [Line Items]
Purchase price of the assets sold		$ 17,300
Net cash proceeds from the assets sold		10,800
Total liabilities of the assets sold		12,800
Remaining liability to be paid for the assets sold		6,500
Additional working capital to be expensed for the assets sold		$ 4,300
Disposal transaction closing date	Aug. 12, 2018

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