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Derivative and Hedging Financial Instruments - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended
Jul. 31, 2014
MMBTU
Jun. 30, 2013
MMBTU
Sep. 30, 2014
MMBTU
Nov. 30, 2018
MMBTU
Apr. 30, 2015
MMBTU
Nov. 30, 2014
MMBTU
Jan. 31, 2015
MMBTU
Dec. 20, 2013
Aug. 20, 2014
Dec. 31, 2013
May 21, 2013
May 09, 2013
May 21, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Costless collars covering percentage on its expected natural gas production                       85.00%teng_PercentageOfExpectedNaturalGasProductionCoveredByDerivativeCollars  
Total MMBtu hedged over the period     1.6teng_EnergyVolumeHedgedDuringPeriod                    
Monthly volumes declining of MMBtu 444,534teng_MonthlyEnergyVolumeHedged 207,000teng_MonthlyEnergyVolumeHedged                      
Derivative liabilities fair value     $ (1,048,557)us-gaap_DerivativeLiabilities             $ (125,773)us-gaap_DerivativeLiabilities      
Fixed price covering percentage on its expected natural gas production                 90.00%teng_PercentageOfExpectedNaturalGasProductionCoveredByFixedPriceHedges   90.00%teng_PercentageOfExpectedNaturalGasProductionCoveredByFixedPriceHedges    
Warrant expiry date     Feb. 28, 2015                    
Scenario, Forecast [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Monthly volumes declining of MMBtu       171,940teng_MonthlyEnergyVolumeHedged
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 113,000teng_MonthlyEnergyVolumeHedged
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		                
Scenario, Forecast [Member] | Maximum [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Monthly volumes declining of MMBtu           326,700teng_MonthlyEnergyVolumeHedged
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		              
Scenario, Forecast [Member] | Minimum [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Monthly volumes declining of MMBtu             33,200teng_MonthlyEnergyVolumeHedged
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		            
Morgan Stanley Fixed I [Member] | July 2014 to November 2018 [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Total MMBtu hedged over the period     13,932,171teng_EnergyVolumeHedgedDuringPeriod
/ us-gaap_EnergyAxis
= teng_GasHedgesOneMember
/ us-gaap_StatementScenarioAxis
= teng_JulyTwoThousandAndFourteenToNovemberTwoThousandAndEighteenMember		                    
Morgan Stanley Fixed II [Member] | January 2015 To November 2014 [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Total MMBtu hedged over the period     10,499,038teng_EnergyVolumeHedgedDuringPeriod
/ us-gaap_EnergyAxis
= teng_GasHedgesTwoMember
/ us-gaap_StatementScenarioAxis
= teng_NovemberTwoThousandAndFourteenToJanuaryTwoThousandAndFifteenMember		                    
Price Risk Derivative [Member] | July 2014 to November 2018 [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Derivative liabilities fair value     577,585us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_StatementScenarioAxis
= teng_JulyTwoThousandAndFourteenToNovemberTwoThousandAndEighteenMember		                    
Price Risk Derivative [Member] | January 2015 To November 2014 [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Derivative liabilities fair value     (878,168)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_PriceRiskDerivativeMember
/ us-gaap_StatementScenarioAxis
= teng_NovemberTwoThousandAndFourteenToJanuaryTwoThousandAndFifteenMember		                    
Energy Related Derivative [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Derivative liabilities fair value     32,174us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember		             (125,773)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember		      
Put Option [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Strike Price of Costless Collar                 3.92us-gaap_DerivativePriceRiskOptionStrikePrice
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_PutOptionMember		     4.00us-gaap_DerivativePriceRiskOptionStrikePrice
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_PutOptionMember		  
Put Option [Member] | Maximum [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Strike Price of Costless Collar                         4.38us-gaap_DerivativePriceRiskOptionStrikePrice
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_PutOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Put Option [Member] | Minimum [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Strike Price of Costless Collar                         4.06us-gaap_DerivativePriceRiskOptionStrikePrice
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_PutOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Call Option [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Strike Price of Costless Collar                       4.28us-gaap_DerivativePriceRiskOptionStrikePrice
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember		  
ASD Credit Agreement [Member]                          
Derivative Instruments and Hedging Activities Disclosures [Line Items]                          
Warrants and rights outstanding     2,000,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= teng_AmericanShaleDevelopmentCreditMember		                    
Warrants Rights     19,500us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LineOfCreditFacilityAxis
= teng_AmericanShaleDevelopmentCreditMember		                    
ASD Stock Percentage     19.50%teng_PercentageOfWarrantsRepresentStock
/ us-gaap_LineOfCreditFacilityAxis
= teng_AmericanShaleDevelopmentCreditMember		                    
Warrants exercise price     $ 263.44invest_InvestmentWarrantsExercisePrice
/ us-gaap_LineOfCreditFacilityAxis
= teng_AmericanShaleDevelopmentCreditMember		                    
Repurchase of warrants               $ 9,000,000us-gaap_PaymentsForRepurchaseOfWarrants
/ us-gaap_LineOfCreditFacilityAxis
= teng_AmericanShaleDevelopmentCreditMember