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Stock-Based Compensation - Restricted Stock Units Unvested Roll Forward (Detail) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
6 Months Ended
Jun. 29, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested Beginning balance, Shares | shares 304
Shares, Granted | shares 83
Shares, Vested | shares (103)
Shares, Forfeited | shares (15)
Unvested Ending balance, Shares | shares 269
Weighted-average grant date fair value per share of shares unvested at beginning of period | $ / shares $ 153.31
Weighted-average grant date fair value per share of shares granted | $ / shares 236.28
Weighted-average grant date fair value per share of shares vested | $ / shares 138.61
Weighted-average grant date fair value of shares forfeited | $ / shares 167.10
Weighted-average grant date fair value per share of shares unvested at end of period | $ / shares $ 183.77