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Summary of Significant Accounting Policies - Summary of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Derivative Financial Instruments	$ 55,426	$ 75,304
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Financial Instruments	11,765	222
Bank Credit Facility
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, Carrying Value	800,000	1,250,000
Long-term debt, Fair Value	800,000	1,250,000
Level 1 | 7.5% Senior Notes due 2025 | Long Term Debt
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, Carrying Value	462,296	455,768
Long-term debt, Fair Value	551,266	534,375
Level 1 | 9.75% Senior Notes due 2026 | Long Term Debt
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, Carrying Value	1,271,785	820,057
Long-term debt, Fair Value	1,255,500	765,000
Derivative Financial Instruments | Level 2 and Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Derivative Financial Instruments	60,471	89,192
Derivative financial asset, Fair value	60,471	89,192
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivative Financial Instruments	24,823	4,442
Derivative financial liabilities, Fair value	$ 24,823	$ 4,442

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