Goodwill - Summary of Goodwill Identified by Segment (Detail) - USD ($)	3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, Beginning balance				$ 346,000,000	$ 205,000,000	$ 346,000,000
Additions					117,000,000	276,000,000
Impairment	$ 0	$ (138,000,000)	$ (255,000,000)	(255,000,000)		(393,000,000)
Currency translation adjustments and other					(11,000,000)	(24,000,000)
Goodwill, Ending balance	311,000,000	205,000,000			311,000,000	205,000,000
United States [Member]
Goodwill [Line Items]
Goodwill, Beginning balance				220,000,000		220,000,000
Additions					117,000,000	173,000,000
Impairment						(393,000,000)
Goodwill, Ending balance	117,000,000				117,000,000
Canada (Member)
Goodwill [Line Items]
Goodwill, Beginning balance				101,000,000	88,000,000	101,000,000
Additions						4,000,000
Currency translation adjustments and other					3,000,000	(17,000,000)
Goodwill, Ending balance	91,000,000	88,000,000			91,000,000	88,000,000
International [Member]
Goodwill [Line Items]
Goodwill, Beginning balance				$ 25,000,000	117,000,000	25,000,000
Additions						99,000,000
Impairment						0
Currency translation adjustments and other					(14,000,000)	(7,000,000)
Goodwill, Ending balance	$ 103,000,000	$ 117,000,000			$ 103,000,000	$ 117,000,000