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Commitments and Contingencies - Activity Related to Warranty Accrual (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Commitments and Contingencies Disclosure [Abstract]        
Standard Product Warranty Accrual, Additions from Business Acquisition [1] $ 0 $ 0 $ 2,186 $ 0
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance at beginning of period 10,505 6,622 8,464 6,907
Provision 2,433 2,823 6,051 5,619
Warranty usage [2] (2,659) (1,598) (6,422) (4,679)
Balance at end of period $ 10,279 $ 7,847 $ 10,279 $ 7,847
[1] (1)Warranty assumed as part of the acquisition of the iRobot-related distribution business of Sales On Demand Corporation (see Note 9).
[2] Warranty usage includes costs incurred for warranty obligations and, for the nine month period ended October 1, 2016, the release of warranty liabilities associated with the divestiture of the defense and security business unit.