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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Acquired intangible assets |  |  |
Fair Value | $ 21,125 | $ 3,000 | $ 3,850
Pro forma results |  |  |
Pro forma tax rate used in calculating taxes on income from continuing operations (as a percent) | 28.20% | 44.20% |
Revenues | $ 2,406,062 | $ 2,092,872 |
Income before provision for income taxes | 107,055 | 57,280 |
Net income attributable to Primoris | $ 73,626 | $ 31,415 |
Weighted average common shares outstanding: |  |  |
Basic (in shares) | 51,481 | 51,762 |
Diluted (in shares) | 51,741 | 51,989 |
Earnings per share: |  |  |
Basic (in dollars per share) | $ 1.43 | $ 0.61 |
Diluted (in dollars per share) | $ 1.42 | $ 0.60 |
Tradename |  |  |
Acquired intangible assets |  |  |
Fair Value | $ 2,150 |  |
Tradename | Minimum |  |  |
Acquired intangible assets |  |  |
Amortization Period | 1 year |  |
Tradename | Maximum |  |  |
Acquired intangible assets |  |  |
Amortization Period | 3 years |  |
Non-compete agreements |  |  |
Acquired intangible assets |  |  |
Fair Value | $ 550 |  | 1,350
Non-compete agreements | Minimum |  |  |
Acquired intangible assets |  |  |
Amortization Period | 2 years |  |
Non-compete agreements | Maximum |  |  |
Acquired intangible assets |  |  |
Amortization Period | 5 years |  |
Customer relationships |  |  |
Acquired intangible assets |  |  |
Fair Value | $ 18,150 | $ 3,000 | $ 2,500
Customer relationships | Minimum |  |  |
Acquired intangible assets |  |  |
Amortization Period | 5 years |  |
Customer relationships | Maximum |  |  |
Acquired intangible assets |  |  |
Amortization Period | 10 years |  |
Other |  |  |
Acquired intangible assets |  |  |
Amortization Period | 3 years |  |
Fair Value | $ 275 |  |

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