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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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