XML 103 R89.htm IDEA: XBRL DOCUMENT v3.10.0.1
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