Goodwill - Summary of Goodwill Identified by Segment (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill, Beginning balance	$ 245,000,000		$ 245,000,000	$ 314,000,000
Additions				6,000,000
Impairment	(230,000,000)	$ (81,000,000)	(230,000,000)	(81,000,000)	$ 0
Foreign currency translation adjustments			(15,000,000)	6,000,000
Goodwill, Ending balance		245,000,000	0	245,000,000	314,000,000
United States [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	125,000,000		125,000,000	119,000,000
Additions				6,000,000
Impairment			(125,000,000)
Goodwill, Ending balance		125,000,000		125,000,000	119,000,000
Canada [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	67,000,000		67,000,000	90,000,000
Impairment			(60,000,000)	(27,000,000)
Foreign currency translation adjustments			(7,000,000)	4,000,000
Goodwill, Ending balance		67,000,000		67,000,000	90,000,000
International [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	$ 53,000,000		53,000,000	105,000,000
Impairment			(45,000,000)	(54,000,000)
Foreign currency translation adjustments			$ (8,000,000)	2,000,000
Goodwill, Ending balance		$ 53,000,000		$ 53,000,000	$ 105,000,000