Goodwill and Intangible Assets - Summary of Change in Goodwill (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Accumulated impairment charges	$ 3,244

The accumulated impairment losses related to goodwill as of the balance sheet date.

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=14024403&loc=d3e13816-109267

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