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Long-term Debt, Net - Additional Information (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 06, 2016
USD ($)
shares
May 13, 2014
USD ($)
$ / shares
Dec. 17, 2012
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
Debt instrument            
Compensating cash balance       $ 200,000,000    
Notes            
Debt instrument            
Repurchase price as a percentage of principal amount of debt instrument   100.00% 100.00%      
Specified minimum percentage of principal amount, the holders of which may declare all principal, accrued and unpaid interest to be due and payable immediately, upon the occurrence of an Event of Default   25.00% 25.00%      
Percentage of principal amount, which may be declared by holders of a specified principal amount to be due and payable immediately upon occurrence of an Event of Default   100.00% 100.00%      
2.625% convertible senior notes due 2019            
Debt instrument            
Interest rate (as a percent) 2.625%     2.625%    
Aggregate principal amount of notes issued $ 616,600,000          
Debt conversion, common stock shares issued | shares 30.0          
Debt instrument maturity date       Dec. 01, 2019    
Debt instrument payment terms       Interest is payable semi–annually in arrears on June 1 and December 1 of each year.    
Initial conversion rate of common stock     28.023      
Initial conversion price per share of common stock (in dollars per share) | $ / shares     $ 35.68      
Carrying amount of the equity components     $ 381,400,000      
Debt issue cost allocated to the equity component     $ 9,100,000      
3.125% convertible senior notes due 2024            
Debt instrument            
Interest rate (as a percent) 3.125%     3.125%   3.125%
Aggregate principal amount of notes issued $ 95,900,000          
Debt instrument maturity date       May 15, 2024    
Debt instrument payment terms       Interest is payable semi–annually in arrears on May 15 and November 15 of each year.    
Initial conversion rate of common stock   43.3604        
Initial conversion price per share of common stock (in dollars per share) | $ / shares   $ 23.06        
Carrying amount of the equity components   $ 464,700,000        
Debt issue cost allocated to the equity component   $ 11,100,000        
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable       20 days    
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable       30 days    
Minimum sale price of common stock to determine eligibility of conversion | $ / shares       $ 30.00    
Number of business days after any five consecutive trading day period during the note measurement period       5 days    
Number of consecutive trading days before five consecutive business days during the note measurement period       5 days    
Convertibility of debt, trading price of debt test, percentage of closing price of stock used in calculation       98.00%    
10.75% first lien notes            
Debt instrument            
Interest rate (as a percent) 10.75%     10.75%    
Aggregate principal amount of notes issued $ 500,000,000          
Percentage of aggregate principal amount for cash 98.00%          
Derivative liabilities $ 24,800,000          
Debt instrument maturity date       Dec. 06, 2021    
Debt instrument payment terms       Interest is payable semi–annually in arrears on each June 1 and December 1 of each year.    
Debt instrument redemption, description       Prior to December 1, 2018, we may redeem the First Lien Notes, at our option, at a redemption price equal to 100% of the outstanding principal amount of such notes plus the applicable premium (as defined in the First Lien Indenture). On and after December 1, 2018, the First Lien Notes may be redeemed in multiples of $1,000 principal amount at a redemption price equal to 100% of the First Lien Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.    
10.75% first lien notes | Prior to December 1, 2018            
Debt instrument            
Percentage of aggregate principal amount for cash       100.00%    
10.75% first lien notes | On or after December 1, 2018            
Debt instrument            
Percentage of aggregate principal amount for cash       100.00%    
Debt instrument multiples of principle amount plus accrued and unpaid interest redemption       $ 1,000    
10.75% first lien notes | Minimum            
Debt instrument            
Compensating cash balance       $ 200,000,000    
10.75% first lien notes | Cobalt International Energy Overseas Ltd            
Debt instrument            
Percentage of debt secured guaranteed 65.00%          
7.75% second lien notes            
Debt instrument            
Interest rate (as a percent) 7.75%     7.75%    
Aggregate principal amount of notes issued $ 584,732,000          
Derivative liabilities 22,800,000          
Debt instrument maturity date       Dec. 01, 2023    
Debt instrument payment terms       Interest is payable semi–annually in arrears on each June 1 and December 1 of each year    
Facility Agreement            
Debt instrument            
Amount outstanding       $ 0    
Facility Agreement | GOM#1            
Debt instrument            
Maximum borrowing capacity         $ 150,000,000  
Write off of debt issuance cost       $ 3,300,000    
General and administrative expenses            
Debt instrument            
Transaction related costs $ 19,600,000