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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Pro forma results |  |
Pro forma tax rate used in calculating taxes on income from continuing operations (as a percent) | 28.00% | 40.00%
Revenues | $ 3,265,690 | $ 3,256,045
Income before provision for income taxes | 107,657 | 14,813
Net income (loss) attributable to Primoris | $ 73,356 | $ 18,072
Weighted average common shares outstanding: |  |
Basic (in shares) | 51,350 | 51,481
Diluted (in shares) | 51,670 | 51,741
Earnings per share: |  |
Basic (in dollars per share) | $ 1.43 | $ 0.35
Diluted (in dollars per share) | $ 1.42 | $ 0.35

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