Reconciliation of Change in Fair Value Measurement of Contingent Consideration Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2014	Mar. 30, 2013
Business Acquisition, Contingent Consideration [Line Items]
Opening balance	$ 1,384	$ 5,151
Changes in fair value	51	111
Closing balance	$ 1,435	$ 5,262

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability 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)(1)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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