Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net - Additional Information (Detail)

v2.4.1.9
Property and Equipment, Net - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Apr. 17, 2013
Jan. 03, 2015
Property, Plant and Equipment [Line Items]        
Depreciation and amortization expense $ 1,934us-gaap_Depreciation $ 2,368us-gaap_Depreciation    
Property and equipment, gross carrying value 70,519us-gaap_PropertyPlantAndEquipmentGross     69,313us-gaap_PropertyPlantAndEquipmentGross
Property and equipment, accumulated depreciation 53,829us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment     52,347us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 16,690us-gaap_PropertyPlantAndEquipmentNet     16,966us-gaap_PropertyPlantAndEquipmentNet
Facility subject to capital lease        
Property, Plant and Equipment [Line Items]        
Excess of net proceeds over the net carrying value of capital leased asset under sale and lease back     376prts_SaleLeaseBackTransactionExcessofNetProceedsOverNetCarryingAmount
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
 
Estimated useful life of property and equipment     20 years  
Property and equipment, gross carrying value 9,964us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
     
Property and equipment, accumulated depreciation 1,239us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
     
Property and equipment, net 8,725us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
     
Philippines        
Property, Plant and Equipment [Line Items]        
Property and equipment, net 192us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_PH
244us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_PH
   
LaSalle, Illinois Facility        
Property, Plant and Equipment [Line Items]        
Amortization expense for capital leased assets $ 911us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= prts_LasalleIllinoisFacilityMember
$ 436us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= prts_LasalleIllinoisFacilityMember