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Reportable Operating Segments (Details 2) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenues and total assets by geographic area |  |  |  |
% of Revenue | 100.00% | 100.00% | 100.00% | 100.00%
Non-United States | Maximum |  |  |  |
Revenues and total assets by geographic area |  |  |  |
% of Revenue |  |  | 1.00% |
Canada |  |  |  |
Revenues and total assets by geographic area |  |  |  |
% of total assets |  |  | 1.00% |

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- Definition The percentage of revenue to total revenue. + 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 The percentage of assets to total assets. + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |