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Organization and Summary of Significant Accounting Policies (Schedule of Capitalized Salaries, Commissions and Benefits, Real Estate Taxes and Interest) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Salaries and benefits $ 1,162pei_CapitalizedSalariesAndBenefits $ 1,059pei_CapitalizedSalariesAndBenefits $ 805pei_CapitalizedSalariesAndBenefits
Real estate taxes 4pei_RealEstateCapitalizedCost 4pei_RealEstateCapitalizedCost 277pei_RealEstateCapitalizedCost
Interest 604us-gaap_InterestCostsCapitalized 874us-gaap_InterestCostsCapitalized 1,549us-gaap_InterestCostsCapitalized
Salaries, commissions and benefits $ 5,446pei_CapitalizedSalariesCommissionsAndBenefits $ 5,261pei_CapitalizedSalariesCommissionsAndBenefits $ 5,336pei_CapitalizedSalariesCommissionsAndBenefits