Annual report pursuant to Section 13 and 15(d)

Summary of Principal Components of Net Deferred Income Tax Liability (Detail)

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Summary of Principal Components of Net Deferred Income Tax Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations $ 1,073 $ 647
Deferred Tax Assets, Operating Loss Carryforwards 175,221 163,437
Deferred tax assets:    
Less: Valuation allowance (114,939) (128,650)
Total net deferred tax assets 81,906 44,610
Deferred income taxes 0 1,949
Deferred Tax Liabilities, Property, Plant and Equipment 83,330 33,413
Deferred Tax Liabilities, Derivatives 0 9,248
Deferred Tax Liabilities, Net 83,330 42,661
Deferred Tax Liabilities, Net, Noncurrent (1,424) 0
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 1,236 2,471
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 340 441
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 880 546
Deferred Tax Assets, Derivative Instruments 4,191 0
Deferred Tax Asset, Interest Carryforward 11,463 3,128
Deferred Tax Assets, Other 2,441 2,590
Deferred Tax Assets, Gross $ 196,845 $ 173,260