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Selected Quarterly Financial Information (Unaudited) (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
Selected Quarterly Financial Information (Unaudited)                      
Revenues $ 480,883 $ 431,842 $ 337,436 $ 291,573 $ 373,066 $ 375,483 $ 351,956 $ 359,645 $ 1,541,734 $ 1,460,150 $ 941,765
Gross Profit 54,819 56,291 44,004 37,596 51,046 52,121 41,406 40,630 192,710 185,203 122,789
Net income 17,932 17,948 11,857 10,530         58,267 58,559 33,616
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
Earnings per share attributable to Primoris:                      
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
Weighted average shares outstanding                      
Basic (in shares) 51,404 51,398 51,435 51,096 51,059 51,054 51,044 49,675 51,391 50,707 42,694
Diluted (in shares) 51,418 51,404 51,435 51,337 51,292 51,054 51,154 51,051 51,406 51,153 46,878