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Transactions with Sponsor (Details) (Olympus Advisory Agreement, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Olympus Advisory Agreement
 
Transactions with Sponsor (Textual) [Abstract]  
Annual fee $ 1.0us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= npci_OlympusAdvisoryAgreementMember