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Indebtedness - Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Jan. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 0		$ 45,356
4.875% Senior Notes Due 2025
Debt Instrument [Line Items]
Interest rate on notes	4.875%		4.875%
5.00% Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes	5.00%		5.00%
5.00% Senior Notes Due 2023
Debt Instrument [Line Items]
Interest rate on notes	5.00%		5.00%
5.75% Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate on notes	5.75%		5.75%
5.875% Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes	5.875%		5.875%
8.25% Senior Notes Due 2029
Debt Instrument [Line Items]
Interest rate on notes	8.25%	8.25%	8.25%
9.25% Senior Notes Due 2026
Debt Instrument [Line Items]
Interest rate on notes	9.25%		9.25%
5.00% Senior Subordinated Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes	5.00%		5.00%
5.00% Senior Subordinated Notes Due 2023
Debt Instrument [Line Items]
Interest rate on notes	5.00%		5.00%
5.75% Senior Subordinated Notes Due 2021
Debt Instrument [Line Items]
Interest rate on notes	5.75%		5.75%
Notes Payable to Banks \| 2.2% Bank Debt
Debt Instrument [Line Items]
Bank debt percentage	2.20%		2.20%