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Concentrations Risk of Company's Purchases and Outstanding Accounts Payable Balances (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Concentration Risk [Line Items]    
Revenues $ 9,980,917us-gaap_SalesRevenueNet $ 5,674,933us-gaap_SalesRevenueNet
Major Supplier Concentration Risk | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable 2,383,898us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
27,998us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
Major Supplier Concentration Risk | Purchases    
Concentration Risk [Line Items]    
Percentage of purchases 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
38.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
Major Supplier Concentration Risk | Revenues    
Concentration Risk [Line Items]    
Revenues 3,385,909us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
1,621,112us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
Major Supplier Concentration Risk | Vendor A | 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_VendorOneMember
Major Supplier Concentration Risk | Vendor A | Purchases    
Concentration Risk [Line Items]    
Percentage of purchases   15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorOneMember
Major Supplier Concentration Risk | Vendor A | Revenues    
Concentration Risk [Line Items]    
Revenues   642,149us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorOneMember
Major Supplier Concentration Risk | Vendor E | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable   25,939us-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]    
Percentage of purchases   12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorFiveMember
Major Supplier Concentration Risk | Vendor E | Revenues    
Concentration Risk [Line Items]    
Revenues   513,534us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorFiveMember
Major Supplier Concentration Risk | Vendor F | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable   2,059us-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]    
Percentage of purchases   11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
Major Supplier Concentration Risk | Vendor F | Revenues    
Concentration Risk [Line Items]    
Revenues   465,429us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorSixMember
Major Supplier Concentration Risk | Vendor H | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable 346,189us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsEightMember
 
Major Supplier Concentration Risk | Vendor H | Purchases    
Concentration Risk [Line Items]    
Percentage of purchases 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsEightMember
 
Major Supplier Concentration Risk | Vendor H | Revenues    
Concentration Risk [Line Items]    
Revenues 1,173,159us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsEightMember
 
Major Supplier Concentration Risk | Vendor I | Accounts Payable    
Concentration Risk [Line Items]    
Accounts payable 2,037,709us-gaap_AccountsPayableCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_AccountsPayableMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsNineMember
 
Major Supplier Concentration Risk | Vendor I | Purchases    
Concentration Risk [Line Items]    
Percentage of purchases 22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsNineMember
 
Major Supplier Concentration Risk | Vendor I | Revenues    
Concentration Risk [Line Items]    
Revenues $ 2,212,750us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= nfec_MajorSupplierConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nfec_VendorsNineMember