Chapter 11 Proceedings - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Liabilities Subject To Compromise [Line Items]
Net loss	$ (98,606)		$ (95,128)	$ (1,105,366)	$ (282,444)
Pre-tax impairment charge		$ 774,000		774,028
Contractual interest expense not recorded	37,834			62,470
Credit Facility [Member]
Liabilities Subject To Compromise [Line Items]
Contractual interest expense not recorded	9,500			13,900
Senior Notes [Member]
Liabilities Subject To Compromise [Line Items]
Contractual interest expense not recorded	$ 28,300			$ 48,500