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Basic and Diluted Loss Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Net income (loss) $ 462us-gaap_NetIncomeLoss $ (14,568)us-gaap_NetIncomeLoss [1]  
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic And Diluted 8parr_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicAndDiluted [2] 0parr_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicAndDiluted [1],[2]  
Net Income (Loss) Available to Common Stockholders, Basic 454us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (14,568)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic [1]  
Basic weighted-average common stock outstanding 37,188,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 30,385,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]  
Add dilutive effects of common stock equivalents $ 193us-gaap_DilutiveSecurities $ 0us-gaap_DilutiveSecurities [1]  
Diluted weighted-average common stock outstanding (in shares) 37,381,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 30,385,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1]  
Income (loss) per common share, basic (USD per share) $ 0.01us-gaap_EarningsPerShareBasic $ (0.48)us-gaap_EarningsPerShareBasic [1]  
Income (loss) per common share, diluted (USD per share) $ 0.01us-gaap_EarningsPerShareDiluted $ (0.48)us-gaap_EarningsPerShareDiluted [1]  
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average number of shares issuable under the common stock warrants 749,148us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 790,683us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 749,148us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Antidilutive securities excluded from computation of earnings per share (shares) 584,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Antidilutive securities excluded from computation of earnings per share (shares) 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		    
[1] Entities with a net loss are prohibited from including potential common shares in the computation of diluted per share amounts. We have utilized the basic shares outstanding to calculate both basic and diluted loss per share for the three months ended March 31, 2014.
[2] Participating securities includes restricted stock that has been issued but is not yet vested.