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Stock Transactions - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Nov. 14, 2011
Mar. 31, 2011
Nov. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 31, 2012
Investor Relations Firm [Member]
Dec. 31, 2012
Investor Relations Firm [Member]
Mar. 31, 2011
Option and Warrant Transactions [Member]
Sep. 30, 2012
Option and Warrant Transactions [Member]
Dec. 31, 2011
Option and Warrant Transactions [Member]
Oct. 14, 2008
Stock Option Plan [Member]
May 04, 2007
Stock Option Plan [Member]
Dec. 31, 2010
Stock Option Plan [Member]
Dec. 31, 2011
Stock Option Plan [Member]
Sep. 30, 2000
2001 Stock Option Plan [Member]
Mar. 31, 2011
Stock Redemption Agreement [Member]
Working Interest Group Llc
Dec. 31, 2012
Officer [Member]
Dec. 31, 2011
Officer [Member]
Dec. 31, 2010
Officer [Member]
Dec. 01, 2012
Four Employees [Member]
Dec. 31, 2012
Four Employees [Member]
Dec. 31, 2011
Board [Member]
Dec. 31, 2012
Director [Member]
Dec. 31, 2012
Employee [Member]
Dec. 31, 2012
Chief Financial Officer [Member]
Dec. 31, 2012
Series Preferred Stock [Member]
Dec. 31, 2011
Series Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                        
Convertible Preferred Stock, Shares Issued upon Conversion                                                     4,779,460  
Preferred stock, par value       $ 0.001 $ 0.001                                           $ 1.00  
Dividends paid on preferred stock                                                     $ 433,696 $ 56,263
Warrants Issued During Period Shares Issued             250,000   2,838,330                                      
Share Based Compensation Arrangement By Share Based Payment Award Warrants Grant Date Fair Value                   154,676 74,164                                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price             $ 0.70     $ 0.90 $ 0.9                 $ 0.4   $ 0.70            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate             82.00%     71.00% 42.00%                     67.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term             2 years     9 months 9 months                 5 years                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate             0.00%     0.00% 0.00%                     0.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate             0.30%     0.25% 0.30%                     0.47%            
Warrants Expenses Recognized Based On Number Of Warrants Exercised                     228,840                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                               200,000                   750,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)                         1,000,000                              
Stock Option Plan Description                       stockholders approved a proposal to amend and restate the 2002-2003 Stock Option Plan to (i) rename it the EnerJex Resources, Inc. Stock Incentive Plan (the "Stock Incentive Plan"), (ii) increase the maximum number of shares of our common stock that may be issued under the Stock Incentive Plan from 1,000,000 to 1,250,000, and (iii) add restricted stock as an eligible award that can be granted under the Stock Incentive Plan.                                
Outstanding December 31, 2011       1,685,000 900,000 900,000                 900,000         900,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value                                           167,032            
Share Based Compensation Arrangements By Share Based Payment Award Options Amount Recognized As Expenses                                   76,938 76,938     18,825            
Share Based Compensation Arrangements By Share Based Payment Award Options Amount Of Expenses Recognized For Future Amortization                                     153,876     148,208            
Share Price   $ 0.6           $ 0.77 $ 0.9 $ 0.90 $ 0.85                     $ 0.56   $ 0.60 $ 0.78      
Stock Issued During Period, Shares, Issued for Services               60,000                             25,000 75,000 40,000      
Stock issued (in shares)   5,727,660                                                    
Stock Repurchased During Period, Shares                                 3,750,000                      
Common Stock Redemption Price Per Share                                 0.4                      
Stock Issued During Period, Shares, Purchase of Assets 100,000                                                      
Stock Issued During Period, Value, Issued for Services       130,000                                 785,000              
Description Of Securities Purchase Agreement   each investor received a stock purchase warrant to purchase 1 share of common stock at a price of $0.90 per share, for each 2 shares of common stock purchased. Each Warrant was exercisable until December 31, 2011                                                    
Stock Repurchased and Retired During Period, Shares     2,000,000                                                  
Purchase of Treasury Stock     323,035 226,000 1,500,000                                              
Notes Payable     825,000                                                  
Debt Instrument, Interest Rate, Stated Percentage     0.24%                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value             $ 86,000                                          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used                           307,751                            
Preferred dividends payable       $ 174,763 $ 0                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number       450,000                                                
Common Stock, Capital Shares Reserved for Future Issuance       5,000,000