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Interest Expense on Convertible Senior Notes (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Debt Instrument        
Contractual interest expense on the coupon $ 1,438 $ 1,438 $ 2,875 $ 2,875
Amortization of the discount component and debt issue fees recognized as interest expense 3,653 3,477 7,262 6,911
Total interest expense on the convertible debt $ 5,091 $ 4,915 $ 10,137 $ 9,786