Chapter 11 Proceedings - Summary of Liabilities Subject to Compromise (Detail) $ in Thousands	Dec. 31, 2020 USD ($)
Debt subject to compromise:
Borrowings under RCF	$ 436,000
Senior Notes	2,000,000
Lease liabilities	112,646
Accrued interest	47,636
Accounts payable	16,725
Other accrued liabilities	1,302
Other liabilities	4,496
Total liabilities subject to compromise	2,618,805
3.45% Senior Notes due 2023 [Member]
Debt subject to compromise:
Senior Notes	250,000
7.875% Senior Notes due 2025 [Member]
Debt subject to compromise:
Senior Notes	500,000
5.70% Senior Notes due 2039 [Member]
Debt subject to compromise:
Senior Notes	500,000
4.875% Senior Notes due 2043 [Member]
Debt subject to compromise:
Senior Notes	$ 750,000