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Employee Benefit Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Contributions made to profit sharing plan | $ 0.3 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 0.3 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 0.3 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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