CarParts.com, Inc. Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Summary of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 69,313us-gaap_PropertyPlantAndEquipmentGross	$ 82,207us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, amortization and impairment	(52,347)	(62,544)
Property and equipment, net	16,966us-gaap_PropertyPlantAndEquipmentNet	19,663us-gaap_PropertyPlantAndEquipmentNet
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	630	630
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,877	8,877
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,799	12,163
Computer software (purchased and developed)
Property, Plant and Equipment [Line Items]
Property and equipment, gross	45,170	55,383
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	136	264
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,761	1,767
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,036	1,057
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,904	$ 2,066