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Sale of Oil and Gas Properties - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Dec. 13, 2013
acre
Jan. 24, 2013
Well
Feb. 28, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
May 21, 2014
acre
Well
Dec. 31, 2012
Mcfe
Oil and Gas Properties [Line Items]                
Sale of interests in non-core assets   $ 2,600,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment   $ 15,259,668us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment $ 2,625,025us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment      
Overriding royalty interest on most of the wells   2.50%teng_PercentOfOverridingRoyaltyInterestOnWells            
Number of wellbores operator assumed   300teng_NumberOfWellboresAssumedByPurchaser            
Production of wells Mcfe per day               800teng_ProductionOfWellsPerDay
Overriding royalty interest retained       5.00%teng_MaximumPercentageOfOverridingRoyaltyInterestOnWellsDrilled        
Lease acres owned by Company, net of curable and incurable title defects 1,114.8us-gaap_GasAndOilAreaDevelopedNet              
Lease acres owned by Company, gross 4,650us-gaap_GasAndOilAreaDevelopedGross              
Total lease acres excluded from sale due to incurable title defects 118.6teng_OilAndGasLeaseAcresExcludedFromSaleDueToIncurableTitleDefects              
Total lease acres owned by company excluded from sale due to incurable title defects 39.8teng_OilAndGasLeaseAcresOwnedByCompanyExcludedFromSaleDueToIncurableTitleDefects              
Additional lease acres excluded from sale due to curable title defects 135.5teng_AdditionalOilAndGasLeaseAcresExcludedFromSaleDueToCurableTitleDefects              
Additional lease acres owned by Company excluded from sale due to curable title defects 30.7teng_AdditionalOilAndGasLeaseAcresOwnedByCompanyExcludedFromSaleDueToCurableTitleDefects              
Expected additional amount due and payable to Company           200,000teng_ExpectedTitleDefectsCurableDueAndPayableAmount    
Cash received 10,600,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment     259,544us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment   230,064us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment    
Total purchase price 36,300,000teng_PurchasePriceForOilAndGasLeaseAcreage              
Cash received related to curable title defects     489,608teng_ProceedsFromSaleOfCurableTitleDefects          
Deferred gain on sale of assets       6,959,817us-gaap_DeferredGainOnSaleOfProperty        
Republic PSA [Member]                
Oil and Gas Properties [Line Items]                
Cash received             15,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember		  
Undeveloped leasehold, net acres             2,239teng_AreaOfUndevelopedLand
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember		  
Number of wells drilled in Marshall County, West Virginia             6teng_NumberOfWellsWithOverridingRoyaltyInterest
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember		  
Percentage of net profits to be received             25.00%teng_PercentageOfNetProfitsToBeReceivedFromJointVenture
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember		  
Value of oil and gas properties to be repurchased             15,000,000teng_ValueOfOilAndGasPropertiesToBeRepurchased
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember		  
Deferred gain on sale of assets       $ 6,959,816us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember		        
Republic PSA [Member] | Wetzel County West Virginia [Member]                
Oil and Gas Properties [Line Items]                
Percentage of over-riding royalty interest             1.50%teng_PercentageOfOverridingRoyaltyInterestRate
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember
/ us-gaap_StatementGeographicalAxis
= teng_WetzelCountyWVMember		  
Republic PSA [Member] | Marshall County West Virginia [Member]                
Oil and Gas Properties [Line Items]                
Percentage of over-riding royalty interest             1.00%teng_PercentageOfOverridingRoyaltyInterestRate
/ us-gaap_LineOfCreditFacilityAxis
= teng_RepublicPurchaseAndSaleAgreementMember
/ us-gaap_StatementGeographicalAxis
= teng_MarshallCountyWVMember		  
Purchase and Sale Agreement [Member]                
Oil and Gas Properties [Line Items]                
Membership interest in purchase and sale agreement             25.00%teng_PercentageOfMembershipInterestToBeAcquiredAsPerAgreement
/ us-gaap_LineOfCreditFacilityAxis
= teng_PurchaseAndSaleAgreementMember		  
Portion of future leasehold expenditures             50.00%teng_PercentageOfLeaseholdExpenditures
/ us-gaap_LineOfCreditFacilityAxis
= teng_PurchaseAndSaleAgreementMember		  
Purchase and Sale Agreement [Member] | Condition [Member]                
Oil and Gas Properties [Line Items]                
Membership interest in purchase and sale agreement             12.00%teng_PercentageOfMembershipInterestToBeAcquiredAsPerAgreement
/ us-gaap_LineOfCreditFacilityAxis
= teng_PurchaseAndSaleAgreementMember
/ us-gaap_SubsequentEventTypeAxis
= teng_ConditionMember