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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 |

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the maximum percentage of participant's prior year earned bonus amount up to which common stock can be purchased under the deferred compensation arrangement. + References No definition available. + Details
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- Definition Represents percentage of average market closing prices used in determining number of common stock that could be purchased by participants. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of participant's annual earned bonus deferred under the deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | prim_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of deferral of annual earned bonus under the deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | prim_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Represents the period of payment of deferred benefits under the deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | prim_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period over which deferred benefits vest under the deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | prim_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant