Summary of Goodwill (Parenthetical) (Detail) $ in Thousands	Sep. 30, 2016 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