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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Document Period End Date			Sep. 26, 2020
Net income	$ 93,252	$ 35,532	$ 133,733	$ 65,259
Weighted-average shares outstanding	28,031	28,154	28,084	28,029
Dilutive effect of employee stock options and restricted shares	508	496	418	730
Diluted weighted-average shares outstanding	28,539	28,650	28,502	28,759
Basic income per share	$ 3.33	$ 1.26	$ 4.76	$ 2.33
Diluted income per share	$ 3.27	$ 1.24	$ 4.69	$ 2.27
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	100	400	200	100

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