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Organization and Business (Details) (USD $)
1 Months Ended 12 Months Ended
Apr. 30, 2012
Dec. 31, 2012
Apr. 25, 2012
Stock issuances and other information      
Common stock, par value (in dollars per share)   0.01  
Proceeds from registration and sale, net of estimated offering expenses   213,569,000  
Initial public offering
     
Stock issuances and other information      
Initial public offering, aggregate number of shares of common stock sold 27,600,000    
Common stock, par value (in dollars per share)     $ 0.01
Number of shares of stock sold by the selling shareholders 6,000,000    
Number of shares of sold by the selling stockholders pursuant to an option granted to the underwriters to cover over-allotments 3,600,000    
Public offering price (in dollars per share)     $ 13.00
Proceeds from initial public offering 358,800,000    
Underwriting discounts and commissions 21,500,000    
Net proceeds to selling stockholders 117,300,000    
Net proceeds from registration and sale 220,000,000    
Number of shares of common stock sold 18,000,000 18,000,000  
Proceeds from registration and sale, net of estimated offering expenses 213,600,000    
Amount of net proceeds from initial public offering used to redeem convertible preferred units, including interest and other charges 67,100,000    
Amount of borrowings repaid under the facility 99,000,000    
Amount of net proceeds from common stock offering used to fund the execution of company's growth strategy through its drilling program $ 47,500,000    
Number of shares sold by the selling stockholders     9,600,000