Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended
Apr. 30, 2014	Jul. 31, 2010 Patents	Dec. 31, 2009 Respondent	Sep. 30, 2009 Respondent
Leases [Abstract]
Number of respondents with whom a settlement was reached			5	2
Number of the company's patents found invalid		2
Proceeds from Legal Settlements	$ 2.6

Cash received for the settlement of litigation during the current period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

Name:	us-gaap_ProceedsFromLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration