Fair Value Measurements - Additional Information (Detail) (USD $)	9 Months Ended	0 Months Ended	9 Months Ended
Sep. 27, 2014	Sep. 28, 2013	Oct. 01, 2011 Auction Rate Security [Member]	Sep. 27, 2014 Auction Rate Security [Member]
Schedule Of Fair Value Measurements [Line Items]
Impairment loss on investment included in other comprehensive income (loss)	$ 412,000	$ 0	$ (412,000)
Impairment loss on investment included in earnings	$ 600,000	$ 0		$ (600,000)

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration