Goodwill and Other Intangible Assets - Summary of Goodwill Amounts by Reporting Unit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, Beginning balance	$ 621,560us-gaap_Goodwill
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod
Dispositions	0
Other	(2,678)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending balance	618,882us-gaap_Goodwill
United States Excluding All Points [Member]
Goodwill [Roll Forward]
Goodwill, Beginning balance	580,420
Acquisitions	0
Dispositions	0
Other	0
Goodwill, Ending balance	580,420
All Points [Member]
Goodwill [Roll Forward]
Goodwill, Beginning balance	3,360
Acquisitions	0
Dispositions	0
Other	0
Goodwill, Ending balance	3,360
Canada [Member]
Goodwill [Roll Forward]
Goodwill, Beginning balance	32,844
Acquisitions	0
Dispositions	0
Other	(2,568)
Goodwill, Ending balance	30,276
Mexico [Member]
Goodwill [Roll Forward]
Goodwill, Beginning balance	4,936
Acquisitions	0
Dispositions	0
Other	(110)
Goodwill, Ending balance	4,826
Australia [Member]
Goodwill [Roll Forward]
Goodwill, Beginning balance	0
Acquisitions	0
Dispositions	0
Other	0
Goodwill, Ending balance	$ 0

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.

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=14024403&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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- 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=14024403&loc=d3e13816-109267

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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- Definition

Amount of divestiture 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

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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