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Income Taxes - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]                        
Income tax (benefit) expense   $ (95,581,000) $ (13,705,000) $ (129,488,000) $ (41,976,000) $ (164,287,000) $ (134,781,000) $ (61,975,000) $ 22,366,000 $ (280,750,000) $ (338,677,000) $ 396,503,000
Deferred tax liabilities   943,343,000       $ 777,947,000       943,343,000 $ 777,947,000  
Deductible limit   1,000,000               1,000,000    
Alternative minimum tax carryforwards   1,000,000,000               1,000,000,000    
Accrued interest or penalties related to tax amounts   0               0    
MRD                        
Income Taxes [Line Items]                        
Net deferred tax asset resulting from federal net operating loss $ 12,400,000   $ 12,400,000                  
Anticipated utilization of net operating loss 100.00%                      
Accounting Standards Update 2016-09                        
Income Taxes [Line Items]                        
Income tax (benefit) expense         $ (41,976,000)              
Net deferred tax asset resulting from federal net operating loss   403,400,000               $ 403,400,000    
Minimum                        
Income Taxes [Line Items]                        
Period during which net operating loss carryforwards and alternative minimum tax expire                   Dec. 31, 2018    
Maximum                        
Income Taxes [Line Items]                        
Period during which net operating loss carryforwards and alternative minimum tax expire                   Dec. 31, 2035    
Alternative Minimum Tax                        
Income Taxes [Line Items]                        
AMT credit carryforwards that are not subject to limitation or expiration   9,700,000               $ 9,700,000    
California, Colorado, Mississippi, New Mexico, Oklahoma and West Virginia                        
Income Taxes [Line Items]                        
Valuation allowance to net operating loss carryforward   24,500,000               24,500,000    
Louisiana                        
Income Taxes [Line Items]                        
Valuation allowance to net operating loss carryforward   1,500,000               1,500,000    
Pennsylvania                        
Income Taxes [Line Items]                        
Valuation allowance to net operating loss carryforward   32,400,000               32,400,000    
Federal and State                        
Income Taxes [Line Items]                        
Net operating loss carryforwards   1,200,000,000               1,200,000,000    
Deferred compensation plan                        
Income Taxes [Line Items]                        
Valuation allowances   $ 4,200,000               $ 4,200,000