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Commitments and Contingencies - Activity Related to Warranty Accrual (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 7,602 $ 6,322 $ 6,497 $ 6,057
Provision 1,679 773 5,444 1,832
Warranty usage (1,356) [1] (407) [1] (4,016) [1] (1,201) [1]
Balance at end of period $ 7,925 $ 6,688 $ 7,925 $ 6,688
[1] Warranty usage includes costs incurred for warranty obligations.