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Business Combinations (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	$ 483,545	$ 537,753	$ 879,323	$ 1,022,277
Income before provision for income taxes	6,032	27,563	6,971	43,605
Net income attributable to Primoris	$ 3,638	$ 16,578	$ 4,219	$ 26,000
Weighted average common shares outstanding:
Basic (in shares)	51,666	51,655	51,619	51,631
Diluted (in shares)	51,815	51,804	51,770	51,759
Earnings per share:
Basic (in dollars per share)	$ 0.07	$ 0.32	$ 0.08	$ 0.50
Diluted (in dollars per share)	$ 0.07	$ 0.32	$ 0.08	$ 0.50

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

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