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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 5 Months Ended 12 Months Ended 80 Months Ended
Dec. 31, 2019
Aug. 31, 2018
Feb. 28, 2018
Aug. 31, 2017
Mar. 31, 2017
Feb. 28, 2017
Aug. 31, 2016
Feb. 29, 2016
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Oct. 31, 2019
May 31, 2018
Common Stock                              
Common stock, shares authorized 90,000,000               90,000,000 90,000,000 90,000,000   90,000,000    
Common stock, par value (in dollars per share) $ 0.0001               $ 0.0001 $ 0.0001 $ 0.0001   $ 0.0001    
Common stock, shares issued 48,665,138               50,715,518 48,665,138 50,715,518   48,665,138    
Common stock, shares outstanding 48,665,138               50,715,518 48,665,138 50,715,518   48,665,138    
Shares of common stock issued as a part of quarterly compensation of non-employee members of the Board of Directors   10,092 10,062 11,448   11,784 16,877 13,278              
Period of restriction on trade for shares issued to non-employee members of the board of directors under the Primoris Long-term Retention Plan                   1 year          
Aggregate purchase price up to which shares can be acquired under share repurchase program   $ 20.0       $ 5.0               $ 50.0 $ 5.0
Number of shares purchased and cancelled under the share repurchase program         216,350       825,146            
Amount paid for shares purchased and cancelled under share repurchase program         $ 5.0       $ 20.0            
Average cost of repurchased shares of stock (in dollars per share)         $ 23.10       $ 24.24            
Preferred Stock                              
Preferred stock, authorized (in shares) 1,000,000               1,000,000 1,000,000 1,000,000 1,000,000 1,000,000    
Par value of preferred stock (in dollars per share) $ 0.0001               $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001    
Preferred stock, shares outstanding 0               0 0 0 0 0    
Former Board of Director                              
Common Stock                              
Price of shares issued (in dollars per share) $ 21.58                 $ 21.58     $ 21.58    
Number of shares purchased and cancelled under the share repurchase program 2,316,960                 2,316,960          
Amount paid for shares purchased and cancelled under share repurchase program $ 50.0                 $ 50.0          
Average cost of repurchased shares of stock (in dollars per share) $ 21.58                            
PICP                              
Common Stock                              
Shares of common stock issued under the long-term incentive plan                   114,106 71,757 65,429      
Amount received in exchange for shares of common stock under a long term incentive plan                   $ 1.8 $ 1.5 $ 1.1      
Percentage of average market closing prices used in determining number of common stock that could be purchased by participants                   75.00% 75.00% 75.00%      
Trading restriction                   6 months          
Equity Plan                              
Common Stock                              
Shares of common stock reserved for issuance upon exercise of all future stock option grants, SARS and grants of restricted shares under the 2013 Equity Plan                 1,450,078   1,450,078        
Equity Plan | Restricted Stock Units                              
Common Stock                              
Granted, Units                   25,360 144,920 10,000 423,105