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Concentrations Risk of Company's Purchases and Outstanding Accounts Payable Balances (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Concentration Risk [Line Items]    
Purchases $ 883,303us-gaap_CostOfGoodsSold $ 1,235,521us-gaap_CostOfGoodsSold
Major Supplier Concentration Risk | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable 945,215us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
146,410us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
Major Supplier Concentration Risk | Purchases    
Concentration Risk [Line Items]    
Purchases 630,986us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
492,201us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
Percentage of purchases 54.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
35.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
Major Supplier Concentration Risk | Vendors C | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable   0us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorThreeMember
Major Supplier Concentration Risk | Vendors C | Purchases    
Concentration Risk [Line Items]    
Purchases   144,521us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorThreeMember
Percentage of purchases   10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorThreeMember
Major Supplier Concentration Risk | Vendor E | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable   122,521us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorFiveMember
Major Supplier Concentration Risk | Vendor E | Purchases    
Concentration Risk [Line Items]    
Purchases   210,905us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorFiveMember
Percentage of purchases   15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorFiveMember
Major Supplier Concentration Risk | Vendor F | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable 383,350us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
23,889us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
Major Supplier Concentration Risk | Vendor F | Purchases    
Concentration Risk [Line Items]    
Purchases 270,204us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
136,775us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
Percentage of purchases 23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
Major Supplier Concentration Risk | Vendor J | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable 425,035us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsTenMember
 
Major Supplier Concentration Risk | Vendor J | Purchases    
Concentration Risk [Line Items]    
Purchases 236,888us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsTenMember
 
Percentage of purchases 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsTenMember
 
Major Supplier Concentration Risk | Vendor K | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable 136,830us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsElevenMember
 
Major Supplier Concentration Risk | Vendor K | Purchases    
Concentration Risk [Line Items]    
Purchases $ 123,894us-gaap_CostOfGoodsSold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsElevenMember
 
Percentage of purchases 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsElevenMember