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Stockholders' Equity (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Apr. 12, 2010
Aug. 31, 2012
Mar. 31, 2012
Feb. 29, 2012
Aug. 31, 2011
Mar. 31, 2011
Jun. 30, 2012
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2009
May 31, 2012
Maximum
Mar. 12, 2012
Sprint
Dec. 31, 2012
Sprint
Mar. 31, 2010
Former Primoris
2009 earnout target
Dec. 31, 2012
JCG
Mar. 31, 2011
JCG
2010 earnout target
Mar. 31, 2010
Craven
2009 earnout target
Nov. 12, 2010
Rockford
Mar. 31, 2011
Rockford
2010 earnout target
Dec. 31, 2012
Rockford
2010 earnout target
Apr. 30, 2012
Rockford
2011 earnout target
Dec. 31, 2012
Rockford
2011 earnout target
Feb. 28, 2013
Q3 Contracting
Dec. 31, 2012
Q3 Contracting
Nov. 17, 2012
Q3 Contracting
Stockholders' equity                                                  
Common stock, authorized (in shares)               90,000,000 90,000,000                                
Par value of common stock (in dollars per share)               $ 0.0001 $ 0.0001                                
Common stock issued (in shares)               51,403,686 51,059,132                                
Common stock outstanding (in shares)               51,403,686 51,059,132                                
Number of holders of common stock               302                                  
Amount received in exchange for shares of common stock under a purchase arrangement     $ 1,240,000     $ 647,000                                      
Shares of common stock issued to managers and executives under a purchase arrangement within the Long-Term Incentive Plan     111,790     94,966   111,790 94,966                                
Shares of common stock reserved for issuance upon exercise of all future stock option grants, SARS and grants of restricted shares under the 2008 Equity Plan               1,270,744                                  
Shares of common stock issued as a part of quarterly compensation of non-employee members of the Board of Directors   15,280   12,395 14,825     27,675 14,825                                
Value of company's common stock issuable as part of acquisition                       980,000           13,600,000           430,000 430,000
Price of shares issued (in dollars per share)                                               $ 14.69  
Stock issued to sellers (in shares)                   81,852.78   62,052 62,052 2,499,975   1,095,646 74,906 1,605,709 494,095 494,095 232,637 232,637 29,273    
Aggregate purchase price up to which shares can be acquired under share repurchase program                     20,000,000                            
Number of shares purchased and cancelled under the share repurchase program             89,600                                    
Amount paid for shares purchased and cancelled under share repurchase program             $ 1,000,000                                    
Average cost of repurchased shares of stock (in dollars per share)             $ 11.17                                    
Preferred stock, authorized (in shares)               1,000,000 1,000,000                                
Par value of preferred stock (in dollars per share)               $ 0.0001 $ 0.0001                                
Preferred stock issued (in shares)                             81,852.78                    
Shares of preferred stock approved by shareholders for conversion into common stock (in shares) 81,852.78                                                
Shares of common stock issued on conversion of preferred stock 8,185,278