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Investments in Subsidiaries (Parenthetical) (Detail) (J.I.C. Enterprises (HK) Ltd. (JICE), HKD)
 1 Months Ended
Feb. 28, 1983
Dec. 31, 2014
Dec. 31, 2013
Aug. 02, 2012
Schedule of Equity Method Investments [Line Items]        
Percentage of Ownership   100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage [1] 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage [1] 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity consideration price per share       1us-gaap_SaleOfStockPricePerShare
Ordinary Shares        
Schedule of Equity Method Investments [Line Items]        
Number of share issued 500,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ dei_LegalEntityAxis
= ntp_SubsidiariesElevenMember
/ us-gaap_StatementClassOfStockAxis
= ntp_OrdinarySharesMember		      
Issued share capital 500,000us-gaap_SaleOfStockConsiderationReceivedPerTransaction
/ dei_LegalEntityAxis
= ntp_SubsidiariesElevenMember
/ us-gaap_StatementClassOfStockAxis
= ntp_OrdinarySharesMember		      
[1] NTHL acquired a 100% equity interest in JICE for a consideration of HK$1.00 on August 2, 2012, which was incorporated in February 1983 in Hong Kong. JICE's issued share capital amounted to HK$500,000, which is made up of 500,000 ordinary shares of HK$1 each. The primary reason for the acquisition was for re-organization.