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Deferred Compensation Agreements and Stock-Based Compensation (Details) - LTR Plan - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 5,700 |  | $ 4,500
Maximum percentage of participant's earned bonus amount up to which common stock can be purchased in a stock purchase plan | 16.67% |  |
Percentage of average market closing prices used in determining number of common stock that could be purchased by participants | 75.00% | 75.00% | 75.00%

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- References No definition available. + Details
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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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- 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
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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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- 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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- Details
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Period Type: |