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Dividends and Earnings Per Share (Details 2) (Equity Plan, Restricted Stock Units)
0 Months Ended 3 Months Ended 11 Months Ended
Mar. 24, 2014
May 03, 2013
Mar. 31, 2015
Mar. 24, 2014
Equity Plan | Restricted Stock Units
       
Earnings per share        
Shares granted 48,512us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= prim_EquityIncentivePlan2013Member
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= prim_EquityIncentivePlan2013Member
  148,512us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= prim_EquityIncentivePlan2013Member
Accrued Dividend Equivalent Units     168prim_AccruedDividendEquivalentUnits
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= prim_EquityIncentivePlan2013Member