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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income $ 17,932 $ 17,948 $ 11,857 $ 10,530         $ 58,267 $ 58,559 $ 33,616
Net income attributable to non-controlling interests                 (1,511)    
Net income attributable to Primoris $ 17,021 $ 17,516 $ 11,733 $ 10,486 $ 12,471 $ 19,348 $ 14,462 $ 12,278 $ 56,756 $ 58,559 $ 33,616
Denominator:                      
Weighted average shares for computation of basic earnings per share 51,404 51,398 51,435 51,096 51,059 51,054 51,044 49,675 51,391 50,707 42,694
Dilutive effect of warrants and units (in shares)                   51 908
Dilutive effect of contingently issuable shares                   386 989
Dilutive effect of shares issued to independent directors                 11 9  
Dilutive effect of JCG convertible preferred shares                     2,287
Dilutive effect of shares to be issued to Q3C sellers                 4    
Weighted average shares for computation of diluted earnings per share 51,418 51,404 51,435 51,337 51,292 51,054 51,154 51,051 51,406 51,153 46,878
Earnings per share:                      
Basic earnings per share (in dollars per share) $ 0.33 $ 0.34 $ 0.23 $ 0.21 $ 0.24 $ 0.38 $ 0.28 $ 0.25 $ 1.10 $ 1.15 $ 0.79
Diluted earnings per share (in dollars per share) $ 0.33 $ 0.34 $ 0.23 $ 0.20 $ 0.24 $ 0.38 $ 0.28 $ 0.24 $ 1.10 $ 1.14 $ 0.72