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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 56 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2017 shares | Feb. 28, 2017 USD ($) shares | Dec. 31, 2016 USD ($) $ / shares shares | Aug. 31, 2016 USD ($) shares | Feb. 29, 2016 shares | Aug. 31, 2015 shares | Mar. 31, 2015 shares | Mar. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) item $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2017 $ / shares shares
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 90,000,000 |  |  |  |  |  | 90,000,000 | 90,000,000 |  | 90,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Common stock, shares issued |  |  | 51,576,442 |  |  |  |  |  | 51,448,753 | 51,576,442 |  | 51,448,753
Common stock, shares outstanding |  |  | 51,576,442 |  |  |  |  |  | 51,448,753 | 51,576,442 |  | 51,448,753
Number of holders of common stock | item |  |  |  |  |  |  |  |  | 365 |  |  |
Shares of common stock issued as a part of quarterly compensation of non-employee members of the Board of Directors | 11,448 | 11,784 |  | 11,745 | 10,450 | 9,748 | 8,168 |  |  |  |  |
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 | $ |  | $ 5,000 |  | $ 5,000 |  |  |  |  |  |  |  |
Number of shares purchased and cancelled under the share repurchase program |  |  | 207,800 |  |  |  |  | 216,350 |  |  | 0 |
Amount paid for shares purchased and cancelled under share repurchase program | $ |  |  | $ 5,000 |  |  |  |  | $ 5,000 |  |  |  |
Amount paid for shares purchased and cancelled under share repurchase program (per share) | $ / shares |  |  | $ 24.02 |  |  |  |  | $ 23.10 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, authorized (in shares) |  |  | 1,000,000 |  |  |  |  |  | 1,000,000 | 1,000,000 |  | 1,000,000
Par value of preferred stock (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Preferred stock, shares outstanding |  |  | 0 |  |  |  |  |  | 0 | 0 | 0 | 0
Warrants |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  | 0 |  |  |  |  |  | 0 | 0 | 0 | 0
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Granted, Units |  |  |  |  |  |  |  |  |  |  |  | 259,065
LTR Plan |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued under the long-term incentive plan |  |  |  |  |  |  |  |  | 65,429 | 85,907 | 96,828 |
Amount received in exchange for shares of common stock under a long term incentive plan | $ |  |  |  |  |  |  |  |  | $ 1,100 | $ 1,400 | $ 1,600 |
Trading restriction |  |  |  |  |  |  |  |  | 6 months |  |  |
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% |
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 |  |  |  |  |  |  |  |  | 1,853,494 |  |  | 1,853,494
Equity Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Granted, Units |  |  |  |  |  |  |  |  | 10,000 | 100,553 | 0 | 259,065

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