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Stockholders' Equity (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 5 Months Ended | 12 Months Ended | 68 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) shares | Feb. 28, 2018 shares | Aug. 31, 2017 shares | Mar. 31, 2017 USD ($) $ / shares shares | Feb. 28, 2017 USD ($) shares | Dec. 31, 2016 USD ($) $ / shares shares | Aug. 31, 2016 USD ($) shares | Feb. 29, 2016 shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) item $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | May 31, 2018 USD ($)
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  | 90,000,000 |  |  | 90,000,000 | 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 | $ 0.0001 | $ 0.0001 |
Common stock, shares issued |  |  |  |  |  |  |  |  | 50,715,518 | 50,715,518 | 51,448,753 |  | 50,715,518 |
Common stock, shares outstanding |  |  |  |  |  |  |  |  | 50,715,518 | 50,715,518 | 51,448,753 |  | 50,715,518 |
Number of holders of common stock | item |  |  |  |  |  |  |  |  |  | 369 |  |  |  |
Shares of common stock issued as a part of quarterly compensation of non-employee members of the Board of Directors | 10,092 | 10,062 | 11,448 |  | 11,784 |  | 11,745 | 10,450 |  |  |  |  |  |
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 | $ | $ 20.0 |  |  |  | $ 5.0 |  | $ 5.0 |  |  |  |  |  |  | $ 5.0
Number of shares purchased and cancelled under the share repurchase program |  |  |  | 216,350 |  | 207,800 |  |  | 825,146 |  |  |  |  |
Amount paid for shares purchased and cancelled under share repurchase program | $ |  |  |  | $ 5.0 |  | $ 5.0 |  |  | $ 20.0 |  |  |  |  |
Average cost of repurchased shares of stock (in dollars per share) | $ / shares |  |  |  | $ 23.10 |  | $ 24.02 |  |  | $ 24.24 |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, authorized (in shares) |  |  |  |  |  | 1,000,000 |  |  | 1,000,000 | 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 | $ 0.0001 | $ 0.0001 |
Preferred stock, shares outstanding |  |  |  |  |  | 0 |  |  | 0 | 0 | 0 | 0 | 0 |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted, Units |  |  |  |  |  |  |  |  |  | 403,985 |  |  |  |
LTR Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued under the long-term incentive plan |  |  |  |  |  |  |  |  |  | 71,757 | 65,429 | 85,907 |  |
Amount received in exchange for shares of common stock under a long term incentive plan | $ |  |  |  |  |  |  |  |  |  | $ 1.5 | $ 1.1 | $ 1.4 |  |
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% |  |
Trading restriction |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |
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 |  |  |  |  |  |  |  |  | 1,614,639 | 1,614,639 |  |  | 1,614,639 |
Equity Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted, Units |  |  |  |  |  |  |  |  |  | 144,920 | 10,000 | 100,553 | 403,985 |

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