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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 |  |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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