Balance Sheet Classification of Contingent Consideration Liability (Detail) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Business Combination, Transactions [Line Items]
Other accrued liabilities	$ 859	$ 759
Other accrued liabilities
Business Combination, Transactions [Line Items]
Other accrued liabilities	208	329
Other long-term liabilities
Business Combination, Transactions [Line Items]
Other accrued liabilities	$ 651	$ 430