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Dividends and Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands													3 Months Ended								12 Months Ended
	Nov. 02, 2018	Aug. 02, 2018	May 04, 2018	Feb. 21, 2018	Nov. 02, 2017	Aug. 02, 2017	May 05, 2017	Feb. 21, 2017	Nov. 02, 2016	Aug. 03, 2016	May 02, 2016	Feb. 22, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share
Cash dividend declared (in dollars per share)	$ 0.060	$ 0.060	$ 0.060	$ 0.060	$ 0.060	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055									$ 0.240	$ 0.225	$ 0.220
Numerator:
Net income													$ 34,381	$ 34,805	$ 14,191	$ 4,216	$ 23,808	$ 22,134	$ 22,396	$ 8,512	$ 87,593	$ 76,850	$ 27,725
Net income attributable to noncontrolling interests																					(10,132)	(4,496)	(1,002)
Net income attributable to Primoris													$ 32,367	$ 32,691	$ 11,715	$ 688	$ 22,521	$ 20,597	$ 21,545	$ 7,691	$ 77,461	$ 72,354	$ 26,723
Denominator:
Weighted average shares for computation of basic earnings per share													50,993	51,403	51,531	51,479	51,449	51,441	51,437	51,594	51,350	51,481	51,762
Dilutive effect of shares issued to independent directors																					3	3	3
Dilutive effect of restricted stock units																					317	257	224
Weighted average shares for computation of diluted earnings per share													51,397	51,735	51,793	51,747	51,711	51,707	51,688	51,851	51,670	51,741	51,989
Earnings per share attributable to Primoris:
Basic earnings per share (in dollars per share)													$ 0.63	$ 0.64	$ 0.23	$ 0.01	$ 0.44	$ 0.40	$ 0.42	$ 0.15	$ 1.51	$ 1.41	$ 0.52
Diluted earnings per share (in dollars per share)													$ 0.63	$ 0.63	$ 0.23	$ 0.01	$ 0.44	$ 0.40	$ 0.42	$ 0.15	$ 1.50	$ 1.40	$ 0.51

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