Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Share-Based Compensation - Schedule of Changes in Company's Ownership Interest in AutoMD (Details)

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Stockholders' Equity and Share-Based Compensation - Schedule of Changes in Company's Ownership Interest in AutoMD (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jan. 03, 2015
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]                      
Net loss attributable to U.S. Auto Parts stockholders' $ (2,406)us-gaap_NetIncomeLoss $ (2,494)us-gaap_NetIncomeLoss $ (2,180)us-gaap_NetIncomeLoss $ 201us-gaap_NetIncomeLoss $ (1,325)us-gaap_NetIncomeLoss $ (1,399)us-gaap_NetIncomeLoss $ (9,567)us-gaap_NetIncomeLoss $ (3,343)us-gaap_NetIncomeLoss $ (6,879)us-gaap_NetIncomeLoss $ (15,634)us-gaap_NetIncomeLoss $ (35,978)us-gaap_NetIncomeLoss
Transfers (to) from the noncontrolling interest:                      
Increase in U.S. Auto Parts paid-in-capital from sale of AutoMD common stock                 2,512us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesSaleOfInterestByParent 0us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesSaleOfInterestByParent 0us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesSaleOfInterestByParent
Changes from net loss attributable to U.S. Auto Parts stockholders' and transfers to noncontrolling interest                 $ (4,367)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet $ (15,634)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet $ (35,978)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet