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Discontinued Operations - Additional Information (Detail) - USD ($)
9 Months Ended
Nov. 14, 2018
Aug. 12, 2018
Sep. 30, 2018
Sep. 30, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Cash provided by operating activities of discontinued operations     $ 834,000 $ 795,000
Cash provided by (used) in investing activities of discontinued operations     $ 11,643,000 $ (128,000)
M&I Electric US Operations | Discontinued Operations, Disposed of by Sale        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Total cash purchase price of the assets sold   $ 12,400,000    
Assumed indebtedness   12,800,000    
Escrow deposit   $ 740,000    
Period of escrow deposit secured for certain indemnification obligations   6 months    
Disposal transaction closing date   Aug. 12, 2018    
M&I Electric US Operations | Discontinued Operations, Disposed of by Sale | Subsequent Event        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Decrease in net working capital $ (4,300,000)      
M&I Electric US Operations | Discontinued Operations, Disposed of by Sale | Senior Secured Term Note        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Pay off of Senior Secured Term Note and related interest   $ 6,500,000