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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 10 Months Ended 12 Months Ended
Mar. 05, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
counterparty
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Deferred financing costs       $ 42,900,000    
Allowance for doubtful accounts     $ 0 $ 0 $ 0  
Number of days from date of drilling fee payment to apply advance       90 days    
Proceeds from sale of property       $ 1,075,000 324,852,000  
Gain on sale of properties       0 186,999,000 $ 0
Impairment of oil and gas properties       46,109,000 47,238,000 1,168,000
Capitalized interest costs       18,600,000 8,800,000 4,600,000
Amount of capitalized exploratory well costs that have been capitalized for period greater than one year       $ 0    
Derivative, number of counterparties | counterparty       8    
Past-due receivables from counterparties       $ 0    
Restricted stock awards vesting period       3 years    
Federal            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Stock-based compensation related to unrealized excess tax benefits       $ 9,600,000    
State            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Stock-based compensation related to unrealized excess tax benefits       $ 7,600,000    
1 to 12 months            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Contractual commodity derivative volume, percent       110.00%    
13 to 24 months            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Contractual commodity derivative volume, percent       100.00%    
25 to 36 months            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Contractual commodity derivative volume, percent       75.00%    
37 to 60 months            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Contractual commodity derivative volume, percent       50.00%    
Accounting Standards Update 2015-03            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Decrease in other assets       $ 35,400,000    
Accounting Standards Update 2015-03 | Restatement adjustment            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Decrease in long-term debt     29,300,000   29,300,000  
Minimum            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Annual forfeiture rate       0.00%    
Minimum | Performance share unit awards            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Annual forfeiture rate       2.40%    
Maximum            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Annual forfeiture rate       16.90%    
Maximum | Performance share unit awards            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Annual forfeiture rate       4.90%    
Non-operated oil and natural gas properties            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Proceeds from sale of property $ 324,900,000 $ 324,900,000        
Gain on sale of properties   $ 187,000,000 $ 187,000,000      
Building            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Estimated life of assets       20 years    
Proved oil and gas properties            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Impairment of oil and gas properties         40,000,000 0
Unproved oil and gas properties            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Impairment of oil and gas properties       $ 36,600,000 $ 7,300,000 $ 1,200,000
Salt water disposal facility            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Estimated life of assets       30 years    
Furniture, software and equipment | Minimum            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Estimated life of assets       2 years    
Furniture, software and equipment | Maximum            
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]            
Estimated life of assets       7 years