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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill, Gross Carrying Amount $ 46,781 $ 47,124
Goodwill, Accumulated Amortisation 0 0
Goodwill, Net Carrying Amount 46,781 47,124
Amortizable Intangible Assets, Accumulated Amortisation 4,684 3,798
Intangible Assets, Gross (Excluding Goodwill) 16,250 15,160
Intangible Assets, Net (Excluding Goodwill) 11,566 11,362
T&D [Member]    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill, Gross Carrying Amount 40,224 40,567
Goodwill, Accumulated Amortisation 0 0
Goodwill, Net Carrying Amount 40,224 40,567
C&I [Member]    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Goodwill, Gross Carrying Amount 6,557 6,557
Goodwill, Accumulated Amortisation 0 0
Goodwill, Net Carrying Amount 6,557 6,557
Backlog [Member]    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Amortizable Intangible Assets, Gross Carrying Amount 989 765
Amortizable Intangible Assets, Accumulated Amortisation 989 695
Amortizable Intangible Assets, Net Carrying Amount 0 70
Customer relationships [Member]    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Amortizable Intangible Assets, Gross Carrying Amount 5,266 5,144
Amortizable Intangible Assets, Accumulated Amortisation 3,590 3,103
Amortizable Intangible Assets, Net Carrying Amount 1,676 2,041
Trade names [Member]    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Amortizable Intangible Assets, Gross Carrying Amount 695 695
Amortizable Intangible Assets, Accumulated Amortisation 79 0
Amortizable Intangible Assets, Net Carrying Amount 616 695
Indefinite-lived Intangible Assets 8,556 8,556
Intangible Assets, Gross (Excluding Goodwill) 0 0
Intangible Assets, Net (Excluding Goodwill) 8,556 8,556
Unallocated intangible assets [Member]    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Amortizable Intangible Assets, Gross Carrying Amount 747 0
Amortizable Intangible Assets, Accumulated Amortisation 26 0
Amortizable Intangible Assets, Net Carrying Amount 721 0
Foreign currency translation [Member]    
Schedule Of Intangible Assets And Goodwill [Line Items]    
Amortizable Intangible Assets, Gross Carrying Amount (3) 0
Amortizable Intangible Assets, Accumulated Amortisation 0 0
Amortizable Intangible Assets, Net Carrying Amount $ (3) $ 0