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Summary of Significant Accounting Policies - Changes in Product Warranty Accrual (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Warranty accrual, beginning of period $ 1,416us-gaap_ProductWarrantyAccrual $ 1,161us-gaap_ProductWarrantyAccrual
Provision for warranty costs 339us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease 278us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease
Product Warranty Accrual, Preexisting, Increase (Decrease) (17)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease (76)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Settlements made (258)us-gaap_ProductWarrantyExpense (242)us-gaap_ProductWarrantyExpense
Warranty accrual, end of period $ 1,480us-gaap_ProductWarrantyAccrual $ 1,121us-gaap_ProductWarrantyAccrual