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Net Income per Share - Computation of Earnings Per Share, Basic (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Sep. 26, 2020
Sep. 28, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                
Net income $ 80,768 $ 60,141 $ 18,234 $ 44,729 $ 27,856 $ 23,694 $ 159,143 $ 96,279
Allocation of net income for basic:                
Allocation of net income for basic common stock $ 80,768     $ 44,729     $ 159,143 $ 96,279
Weighted average number of shares for basic:                
Weighted-average number of common shares — basic 12,221     12,099     12,191 11,802
Net income per share for basic:                
Net income per common share — basic $ 6.61     $ 3.70     $ 13.05 $ 8.16
Common Class A                
Allocation of net income for basic:                
Allocation of net income for basic common stock $ 65,074     $ 33,776     $ 126,146 $ 71,761
Weighted average number of shares for basic:                
Weighted-average number of common shares — basic 9,846     9,136     9,663 8,797
Net income per share for basic:                
Net income per common share — basic $ 6.61     $ 3.70     $ 13.05 $ 8.16
Common Class B                
Allocation of net income for basic:                
Allocation of net income for basic common stock $ 15,254     $ 10,581     $ 31,996 $ 23,652
Weighted average number of shares for basic:                
Weighted-average number of common shares — basic 2,308     2,862     2,451 2,899
Net income per share for basic:                
Net income per common share — basic $ 6.61     $ 3.70     $ 13.05 $ 8.16
Unvested participating shares                
Allocation of net income for basic:                
Allocation of net income for basic unvested participating shares $ 440     $ 372     $ 1,001 $ 866
Weighted average number of shares for basic:                
Weighted-average number of common shares — basic 67     101     77 106