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Commitments and Contingencies Capital Lease Payment Schedule (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 382us-gaap_CapitalLeasesFutureMinimumPaymentsRemainderOfFiscalYear
2016 382us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2017 382us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2018 420us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2019 420us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
Thereafter 0parr_CapitalLeasesFutureMinimumPaymentsDueAfterFourYears
Total minimum lease payments 1,986us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Less amount representing interest 460us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Total minimum rental payments $ 1,526us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments