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Dividends and Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands							3 Months Ended		6 Months Ended
	Jul. 15, 2015	May. 01, 2015	Apr. 15, 2015	Feb. 24, 2015	Jan. 15, 2015	Nov. 04, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Dividends and Earnings Per Share
Cash dividend declared (in dollars per share)		$ 0.055		$ 0.04		$ 0.04
Total dividend paid	$ 2,841		$ 2,063		$ 2,062				$ 4,124	$ 3,612
Numerator:
Net income attributable to Primoris							$ 3,638	$ 16,003	$ 5,310	$ 26,836
Denominator:
Weighted average shares for computation of basic earnings per share							51,666	51,655	51,619	51,631
Dilutive effect of shares issued to independent directors									2	2
Dilutive effect of unvested restricted stock units							149	149	149	126
Weighted average shares for computation of diluted earnings per share							51,815	51,804	51,770	51,759
Earnings per share:
Basic earnings per share (in dollars per share)							$ 0.07	$ 0.31	$ 0.10	$ 0.52
Diluted earnings per share (in dollars per share)							$ 0.07	$ 0.31	$ 0.10	$ 0.52

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