Summary of Goodwill (Parenthetical) (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
U.S. Operating Segment
Goodwill [Line Items]
Accumulated impairment losses	$ 214,031
International Operating Segment
Goodwill [Line Items]
Accumulated impairment losses	$ 27,622

Amount of accumulated impairment loss for 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

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant