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Noncontrolling Interests (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) item	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Noncontrolling Interests
Number of joint ventures | item	2								2
Revenue	$ 877,670	$ 908,902	$ 648,787	$ 504,119	$ 579,017	$ 608,311	$ 631,165	$ 561,502	$ 2,939,478	$ 2,379,995	$ 1,996,948
Net income attributable to noncontrolling interests									10,132	4,496	1,002
Distributions to non-controlling interests									13,084
Cash	151,063				170,385				151,063	170,385
Accounts receivable	372,695				291,589				372,695	291,589
Contract assets	364,245				265,902				364,245	265,902
Accounts payable	249,217				140,943				249,217	140,943
Contract liabilities	189,539				169,377				189,539	169,377
Non Controlling Interest
Noncontrolling Interests
Distributions to non-controlling interests									13,084
Carlsbad
Noncontrolling Interests
Revenue									102,868	110,669	7,254
Net income attributable to noncontrolling interests									9,483	1,780	325
Distributions to partners									9,000	0
Cash	3,117				44,308				3,117	44,308
Accounts receivable	4,451				15,343				4,451	15,343
Contract assets	8,158								8,158
Accounts payable	2,279				12,352				2,279	12,352
Contract liabilities	5,946				42,743				5,946	42,743
Due to Primoris	1,979								1,979
Carlsbad | Non Controlling Interest
Noncontrolling Interests
Distributions to partners									9,000
Wilmington
Noncontrolling Interests
Revenue									2,133	31,638	19,781
Net income attributable to noncontrolling interests									649	2,716	$ 677
Distributions to partners									4,100
Non-controlling interest distribution										0
Cash	10				15,948				10	15,948
Accounts receivable					598					598
Accounts payable					759					759
Contract liabilities					1,480					1,480
Due to Primoris					7,428					7,428
Wilmington | Non Controlling Interest
Noncontrolling Interests
Distributions to partners									4,100
Carlsbad and Wilmington
Noncontrolling Interests
Cash	3,127				60,256				3,127	60,256
Accounts receivable	4,451				15,941				4,451	15,941
Contract assets	8,158								8,158
Accounts payable	2,279				13,111				2,279	13,111
Contract liabilities	$ 5,946				$ 44,223				$ 5,946	$ 44,223

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