CarParts.com, Inc. Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net - Summary of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 04, 2015	Jan. 03, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 70,519us-gaap_PropertyPlantAndEquipmentGross	$ 69,313us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, amortization and impairment	(53,829)	(52,347)
Property and equipment, net	16,690us-gaap_PropertyPlantAndEquipmentNet	16,966us-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	10,274	9,799
Computer software (purchased and developed) and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	45,984	45,170
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	138	136
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,762	1,761
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,173	1,036
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,681	$ 1,904