Goodwill and Purchased Intangibles - Additional Information (Detail) (Indefinite life trade name, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Indefinite life trade name
Goodwill And Intangible Assets [Line Items]
Purchased indefinite lived intangibles	$ 918	$ 918

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

Name:	us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant