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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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