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Related Party Transactions - Additional Information (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Related Party Transaction        
Employee termination benefits $ 813,000 $ 107,720,000 $ 8,922,000 $ 118,118,000
Former Chairman and CEO Severance
       
Related Party Transaction        
Employee termination benefits   58,200,000   58,200,000
Severance, compensation cost of accelerated shares   36,800,000   36,800,000
Severance, number of accelerated shares   6.3   6.3
Severance, liability 3,900,000   3,900,000  
Employee Severance | Gulf Properties
       
Related Party Transaction        
Employee termination benefits     8,900,000  
Executive Severance | Permian Properties
       
Related Party Transaction        
Employee termination benefits       $ 23,100,000