Chapter 11 Proceedings - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		8 Months Ended
	Jan. 22, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Liabilities Subject To Compromise [Line Items]
Line of credit				$ 436,000
Reorganization, date plan confirmed		Apr. 08, 2021
Reorganization, effective date of plan		Apr. 23, 2021
Contractual interest expense not recorded		$ 28,266
Accrued post-petition interest incurred		35,329
Interest expense		$ 32,562	$ 32,321
Voting share of percentage		50.00%
Reorganization value		$ 1,130,000
Minimum
Liabilities Subject To Compromise [Line Items]
Reorganization value		805,000
Maximum
Liabilities Subject To Compromise [Line Items]
Reorganization value		1,520,000
Senior Notes [Member]
Liabilities Subject To Compromise [Line Items]
Contractual interest expense not recorded		28,300
Revolving Credit Agreement [Member]
Liabilities Subject To Compromise [Line Items]
Line of credit	$ 950,000
Accrued post-petition interest incurred		32,600
Credit Facility [Member]
Liabilities Subject To Compromise [Line Items]
Accrued post-petition interest incurred		$ 32,600
Interest expense				$ 23,400
5.70% Senior Notes due 2039 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	5.70%	5.70%		5.70%
Senior notes maturity year	2039
3.45% Senior Notes due 2023 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	3.45%	3.45%		3.45%
Senior notes maturity year	2023
4.875% Senior Notes due 2043 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	4.875%	4.875%		4.875%
Senior notes maturity year	2043
7.875% Senior Notes due 2025 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	7.875%	7.875%		7.875%
Senior notes maturity year	2025