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Goodwill - Summary of Goodwill Identified by Segment (Detail) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning balance			$ 346,000,000	$ 346,000,000	$ 333,000,000
Additions				276,000,000	20,000,000
Impairment	$ (138,000,000)	$ (255,000,000)	(255,000,000)	(393,000,000)
Currency translation adjustments and other				(24,000,000)	(7,000,000)
Goodwill, Ending balance	205,000,000			205,000,000	346,000,000
United States [Member]
Goodwill [Line Items]
Goodwill, Beginning balance			220,000,000	220,000,000	202,000,000
Additions				173,000,000	20,000,000
Impairment				(393,000,000)
Currency translation adjustments and other					(2,000,000)
Goodwill, Ending balance					220,000,000
Canada (Member)
Goodwill [Line Items]
Goodwill, Beginning balance			101,000,000	101,000,000	109,000,000
Additions				4,000,000
Currency translation adjustments and other				(17,000,000)	(8,000,000)
Goodwill, Ending balance	88,000,000			88,000,000	101,000,000
International [Member]
Goodwill [Line Items]
Goodwill, Beginning balance			$ 25,000,000	25,000,000	22,000,000
Additions				99,000,000
Impairment				0
Currency translation adjustments and other				(7,000,000)	3,000,000
Goodwill, Ending balance	$ 117,000,000			$ 117,000,000	$ 25,000,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267

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-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 350
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-Paragraph 1
-Subparagraph (f)
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