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Stockholders' Equity (Details Textual) (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Class of Stock [Line Items]    
Unrecognized compensation costs related to restricted stock awards $ 11.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Period of stock option compensation cost recognition 3 years 6 months 11 days  
Restricted Stock [Member]    
Class of Stock [Line Items]    
Compensation cost 1.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 0.6us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 128us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		  
Grants in the period, aggregate fair value 2.5parr_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodAggregateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		  
Employee Stock Option [Member]    
Class of Stock [Line Items]    
Options, issued in period 78parr_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		  
Options, issued in period, weighted average exercise price $ 20.16parr_SharebasedCompensationArrangementsbySharebasedPaymentAwardOptionsIssuedinPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		  
Grants in period, aggregate fair value $ 0.6parr_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsinPeriodAggregateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember