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Nature of Business (Details) - Business Combination Contingent Consideration by Earnout Target Period [Domain] $ in Thousands				1 Months Ended	3 Months Ended			6 Months Ended
	Feb. 28, 2015 USD ($)	Jun. 05, 2014 USD ($)	Jan. 22, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($) item	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Nature of Business
Operating income					$ 7,949		$ 27,981	$ 12,194	$ 48,026
Goodwill					124,562			124,562		$ 119,410
Vadnais Corporation
Nature of Business
Amount of purchase of assets and liabilities				$ 6,354
Surber, Ram-Fab and Williams
Nature of Business
Amount of purchase of assets and liabilities						$ 8,200
Number of small purchases made | item						3
Aevenia
Nature of Business
Amount of purchase of assets and liabilities	$ 22,700
Cash payment made	22,300
Payable to sellers	400
Current assets					4,200			4,200
Current liabilities					2,100			2,100
Plant and equipment					11,200			11,200
Intangibles assets					3,850			3,850
Goodwill					5,150			5,150
West
Nature of Business
Goodwill					45,239			45,239		45,239
West | Vadnais | Vadnais Corporation
Nature of Business
Amount of purchase of assets and liabilities		$ 6,400
East
Nature of Business
Goodwill					43,267			43,267		43,267
East | BWP
Nature of Business
Capitalized property, plant and equipment					13,600			13,600
East | BWP | Blaus Wasser, LLC
Nature of Business
Amount of purchase of assets and liabilities			$ 5,000
Energy
Nature of Business
Goodwill					$ 36,056			$ 36,056		$ 30,904
Energy | Primoris AV | Aevenia
Nature of Business
Amount of purchase of assets and liabilities	22,700
Cash payment made	22,300
Payable to sellers	$ 400
Blythe
Nature of Business
Ownership percentage					50.00%			50.00%

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