Debt - Schedule of Minimum Adjusted EBITDA (Detail) - DIP Credit Agreement [Member]	3 Months Ended
	Mar. 31, 2020 USD ($)
June 30, 2020 [Member]
Debt Instrument [Line Items]
Minimum Adjusted EBITDA	$ 230,000,000
September 30, 2020 [Member]
Debt Instrument [Line Items]
Minimum Adjusted EBITDA	410,000,000
December 31, 2020 [Member]
Debt Instrument [Line Items]
Minimum Adjusted EBITDA	$ 640,000,000