Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v2.4.1.9
Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Apr. 17, 2013
Jul. 01, 2015
Other Commitments [Line Items]        
2015 $ 759us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent      
Initial lease term 5 years      
Facility rent expense 365us-gaap_LeaseAndRentalExpense 462us-gaap_LeaseAndRentalExpense    
Nia Chloe, LLC | Director        
Other Commitments [Line Items]        
Facility rent expense   94us-gaap_LeaseAndRentalExpense
/ us-gaap_CounterpartyNameAxis
= prts_NiaChloeLLCMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember
   
LaSalle, Illinois Facility | STORE        
Other Commitments [Line Items]        
Period of lease under sale and leaseback transaction     20 years  
Initial annual base rent for first year     853us-gaap_SaleLeasebackTransactionAnnualRentalPayments
/ us-gaap_CounterpartyNameAxis
= prts_STOREMasterFundingIIILLCMember
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= prts_LasalleIllinoisFacilityMember
 
Percentage of annual increase in base rent     1.50%prts_SaleLeasebackTransactionIncreaseinAnnualRentalPaymentsPercentage
/ us-gaap_CounterpartyNameAxis
= prts_STOREMasterFundingIIILLCMember
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= prts_LasalleIllinoisFacilityMember
 
Increased percentage in base rent with change in consumer price index     1.25prts_SaleLeasebackTransactionIncreaseinAnnualRentalPaymentsMultipleofChangeinConsumerPriceIndex
/ us-gaap_CounterpartyNameAxis
= prts_STOREMasterFundingIIILLCMember
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= prts_LasalleIllinoisFacilityMember
 
Excess of net proceeds over the net carrying value of capital lease under sale leaseback transaction     376us-gaap_SaleLeasebackTransactionDeferredGainGross
/ us-gaap_CounterpartyNameAxis
= prts_STOREMasterFundingIIILLCMember
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= prts_LasalleIllinoisFacilityMember
 
Facility subject to capital lease        
Other Commitments [Line Items]        
Estimated useful life of property and equipment     20 years  
Facility subject to capital lease | LaSalle, Illinois Facility | STORE        
Other Commitments [Line Items]        
Estimated useful life of property and equipment     20 years  
Scenario, Forecast        
Other Commitments [Line Items]        
Purchase commitments       $ 1,479us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember