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Business Combinations - Acquired Intangible Assets (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Acquired intangible assets    
Fair Value $ 3,000 $ 3,850
Period for which goodwill and other intangible assets are deductible for income tax purposes 15 years  
Pro forma results    
Pro forma tax rate used in calculating taxes on income from continuing operations (as a percent) 40.00% 40.00%
Revenues $ 2,026,867 $ 1,963,754
Income before provision for income taxes 54,328 63,827
Net income attributable to Primoris $ 29,997 $ 38,510
Weighted average common shares outstanding:    
Basic (in shares) 51,762 51,647
Diluted (in shares) 51,989 51,798
Earnings per share:    
Basic (in dollars per share) $ 0.58 $ 0.75
Diluted (in dollars per share) $ 0.58 $ 0.74
Non-compete agreements    
Acquired intangible assets    
Fair Value   $ 1,350
Non-compete agreements | Minimum    
Acquired intangible assets    
Amortization Period 2 years  
Non-compete agreements | Maximum    
Acquired intangible assets    
Amortization Period 5 years  
Customer relationships    
Acquired intangible assets    
Fair Value $ 3,000 $ 2,500
Customer relationships | Minimum    
Acquired intangible assets    
Amortization Period 5 years  
Customer relationships | Maximum    
Acquired intangible assets    
Amortization Period 10 years