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Deferred Compensation Agreements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Primoris Long-Term Retention Plan
    
Deferred compensation agreements    
Percentage of participant's annual earned bonus deferred 50.00%  
Period of deferral of annual earned bonus 1 year  
Total deferred compensation liability $ 4,298 $ 4,281
Maximum percentage of participant's prior year earned bonus amount up to which common stock can be purchased in a stock purchase plan 0.1667%  
Percenatge of average market closing prices used in determining number of common stock that could be purchased by participants 75.00%  
JCG Stakeholder Incentive Plan
    
Deferred compensation agreements    
Total deferred compensation liability $ 1,615 $ 1,600
Vesting period 5 years  
Period of payment of deferred benefit amount plus interest in equal monthly installments 3 years