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Dividends and Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands									3 Months Ended		9 Months Ended
	Oct. 15, 2015	Aug. 04, 2015	Jul. 15, 2015	May. 01, 2015	Apr. 15, 2015	Feb. 24, 2015	Jan. 15, 2015	Nov. 04, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Dividends and Earnings Per Share
Cash dividend declared (in dollars per share)		$ 0.055		$ 0.055		$ 0.04		$ 0.04
Total dividend paid	$ 2,842		$ 2,841		$ 2,063		$ 2,062				$ 6,966	$ 5,421
Numerator:
Net income attributable to Primoris									$ 19,007	$ 27,390	$ 24,317	$ 54,226
Denominator:
Weighted average shares for computation of basic earnings per share									51,672	51,606	51,637	51,622
Dilutive effect of shares issued to independent directors									3	4	3	3
Dilutive effect of unvested restricted stock units									149	149	149	134
Weighted average shares for computation of diluted earnings per share									51,824	51,759	51,789	51,759
Earnings per share:
Basic earnings per share (in dollars per share)									$ 0.37	$ 0.53	$ 0.47	$ 1.05
Diluted earnings per share (in dollars per share)									$ 0.37	$ 0.53	$ 0.47	$ 1.05

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