The charge against earnings in the period to increase loss contingency liabilities, net of any adjustments to reduce previously estimated charges.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Legal Proceedings - Additional Information (Detail)	3 Months Ended	12 Months Ended
Legal Proceedings - Additional Information (Detail)	Dec. 31, 2010 USD ($)	Dec. 31, 2012	Jun. 29, 2012 Patents	Oct. 31, 2011 Patents	Apr. 30, 2010 Patents	Mar. 31, 2010 USD ($)	Mar. 31, 2010 ILS
Contingencies And Commitments [Line Items]
Infringements of number of patents held			1	2	4
Liability recorded in litigation	$ 1,300,000
Amount of ex-parte judgment						$ 1,700,000	6,300,000
Action was dismissed by the Israeli Central District Court		Jun. 26, 2012