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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 23, 2020	Jun. 30, 2020	Jun. 30, 2020
Debt Instrument [Line Items]
Loss on early retirement of debt			$ (861)	$ (861)
Net proceeds of sale of senior notes				450,000
7½% Senior Notes due 2025
Debt Instrument [Line Items]
Senior notes retire upon exchange of common stock			5,600
Long term debt principal amount retired	$ 4,200		4,200	4,200
Loss on early retirement of debt			$ 900	$ 900
Interest rate on debt instrument	7.50%		7.50%	7.50%
7½% Senior Notes due 2025 | Common Stock
Debt Instrument [Line Items]
Common stock issued upon retirement of senior notes, shares			767,096
Common stock issued upon retirement of senior notes, value			$ 5,000
9.75% Senior Notes due 2026
Debt Instrument [Line Items]
Issuance date of senior notes		Jun. 23, 2020
Principal amount of senior notes issued		$ 500,000
Net proceeds of sale of senior notes		$ 441,100
Interest rate on debt instrument	9.75%	9.75%	9.75%	9.75%
Interest payment terms		payable semi-annually on February 15 and on August 15 of each year
Frequency of interest payment		semi-annually
Maturity of senior notes		Aug. 15, 2026
Bank Credit Facility
Debt Instrument [Line Items]
Leverage ratio	400.00%
Current ratio	100.00%
Maturity of credit facility	Jul. 16, 2024
Bank credit facility	$ 1,400,000		$ 1,400,000	$ 1,400,000
Bank Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee on unused borrowing base	0.375%
Bank Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee on unused borrowing base	0.50%
Bank Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Spread rate for interest rate on credit facility	2.25%
Bank Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Spread rate for interest rate on credit facility	3.25%
Bank Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Spread rate for interest rate on credit facility	1.25%
Bank Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Spread rate for interest rate on credit facility	2.25%

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