Quarterly report pursuant to Section 13 or 15(d)

Contingencies - Additional Information (Details)

v3.7.0.1
Contingencies - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 27, 2017
USD ($)
Oct. 28, 2016
USD ($)
Dec. 15, 2014
USD ($)
DeepwaterWell
Jan. 31, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2017
USD ($)
claim
Jun. 28, 2017
USD ($)
May 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2010
USD ($)
Loss Contingencies [Line Items]                    
Obligation to secure financial assurances                 $ 260,800,000  
Notified rescind of obligation to secure financial assurances             $ 260,800,000      
Outstanding obligation to secure financial assurances upon rescindment           $ 0        
Number of deepwater wells abandoned | DeepwaterWell     3              
Escrow deposit           49,500,000        
Loss contingency accrued amount           49,500,000        
Underpayment of royalties       $ 30,000            
Under payment percentage of total royalty payments       0.0045%            
Statutory fine payment relative to underpayment         $ 2,300,000 $ 1,100,000        
Notified disallowed amount in reductions taken by ONRR                   $ 4,700,000
Payments for royalty $ 4,700,000                  
Royalty payment processing revised period           84 months        
Additional royalty payment           $ 1,100,000        
BSEE                    
Loss Contingencies [Line Items]                    
Loss contingency accrued amount           $ 3,300,000        
Number of notices | claim           5        
Proposed civil penalties related to various incidents of noncompliance, total           $ 7,500,000        
Payments for civil penalty           100,000        
Increase in estimated liability           1,800,000        
Apache Corporation                    
Loss Contingencies [Line Items]                    
Escrow deposit           49,500,000        
Apache Corporation | Judicial Ruling                    
Loss Contingencies [Line Items]                    
Amount awarded for non-compliance fines and lawsuits   $ 43,200,000 $ 24,900,000              
Amount offset against litigation compensation amount   $ 17,000,000                
Amount owed to Apache under judicial decision               $ 43,200,000    
Prejudgment interest, attorney fees and judgment costs           6,300,000        
Apache Corporation | Judicial Ruling | Other Income/Expense                    
Loss Contingencies [Line Items]                    
Recognized prejudgment interest, attorney fees and judgment costs.           6,300,000        
Apache Corporation | Judicial Ruling | Asset Retirement Obligation                    
Loss Contingencies [Line Items]                    
Capitalized loss contingency damages payable to other party except attorney fees judgment costs and prejudgment interest           43,200,000        
Apache Corporation | Judicial Ruling | Other Noncurrent Assets                    
Loss Contingencies [Line Items]                    
Escrow deposit               $ 49,500,000    
Apache Corporation | Judicial Ruling | Other Noncurrent Liabilities                    
Loss Contingencies [Line Items]                    
Loss contingency accrued amount           $ 49,500,000