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Nature of Business (Details) $ in Thousands					1 Months Ended	3 Months Ended
	Feb. 28, 2015 USD ($)	Jun. 05, 2014 USD ($)	Jan. 22, 2014 USD ($)	Jan. 22, 2014 USD ($)	Jun. 30, 2014 USD ($)	Sep. 30, 2014 USD ($) item	Sep. 30, 2015 USD ($)
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
West | Vadnais | Vadnais Corporation
Nature of Business
Amount of purchase of assets and liabilities		$ 6,400
East | BWP
Nature of Business
Capitalized property, plant and equipment							$ 13,700
East | BWP | Blaus Wasser, LLC
Nature of Business
Amount of purchase of assets and liabilities			$ 5,000	$ 5,000
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%
Carlsbad
Nature of Business
Ownership percentage							50.00%

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