Quarterly report pursuant to Section 13 or 15(d)

Contingencies - Additional Information (Details)

v3.4.0.3
Contingencies - Additional Information (Details)
 1 Months Ended 3 Months Ended
Jan. 31, 2014
USD ($)
Mar. 31, 2016
USD ($)
claim
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 15, 2014
USD ($)
Dec. 31, 2010
USD ($)
Loss Contingencies [Line Items]            
Total outstanding orders amount   $ 260,800,000        
Underpayment of royalties $ 30,000          
Under payment percentage of total royalty payments 0.0045%          
Statutory fine payment relative to underpayment     $ 2,300,000      
Amount accrued   0   $ 0    
Loss contingency, range of possible loss, minimum         $ 0  
Loss contingency, range of possible loss, maximum         $ 32,000,000  
Insurance claims submitted for removal-of-wreck expenses   43,000,000        
Notified disallowed amount in reductions taken by ONRR           $ 4,700,000
Proposed penalties   $ 1,000,000        
BSEE            
Loss Contingencies [Line Items]            
Number of notices | claim   3        
Proposed civil penalties related to various incidents of noncompliance, total   $ 7,100,000        
Liberty Mutual Insurance Co            
Loss Contingencies [Line Items]            
Insurance claims received   5,000,000        
Revised estimate            
Loss Contingencies [Line Items]            
Insurance claims receivable   31,000,000        
Comprehensive General Liability policy            
Loss Contingencies [Line Items]            
Insurance claims received   1,000,000        
Energy Package            
Loss Contingencies [Line Items]            
Insurance claims received   1,000,000        
Starr Marine            
Loss Contingencies [Line Items]            
Insurance claims received   $ 5,000,000