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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2013
Income Taxes
Effective tax rate on income before taxes and noncontrolling interests (as a percent)	37.82%
Effective tax rate for income attributable to Primoris (as a percent)	38.85%
U.S. federal statutory rate (as a percent)	35.00%
Minimum period of statute of limitations of state and foreign jurisdictions	3 years
Maximum period of statute of limitations of state and foreign jurisdictions	5 years

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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