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Business Combinations (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pro forma results
Percentage of pro forma tax rate used in calculating taxes on income from continuing operations	39.00%	39.00%	39.00%	39.00%
Revenues	$ 555,945	$ 633,195	$ 1,435,268	$ 1,655,472
Income before provision for income taxes	30,843	44,803	37,814	88,398
Net income attributable to Primoris	$ 19,007	$ 28,798	$ 23,226	$ 54,792
Weighted average common shares outstanding:
Basic (in shares)	51,672	51,606	51,637	51,622
Diluted (in shares)	51,824	51,759	51,789	51,759
Earnings per share:
Basic (in dollars per share)	$ 0.37	$ 0.56	$ 0.45	$ 1.06
Diluted (in dollars per share)	$ 0.37	$ 0.56	$ 0.45	$ 1.06

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Represents the pro forma tax rate used in calculating taxes on income from continuing operations for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma number of diluted weighted average shares outstanding for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma number of basic weighted average shares outstanding for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before income taxes for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (h)(2)-(3)



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-Name Accounting Standards Codification



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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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