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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 6 Months Ended
Jun. 27, 2020
Mar. 28, 2020
Jun. 29, 2019
Mar. 30, 2019
Jun. 27, 2020
Jun. 29, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]            
Net income $ 60,141 $ 18,234 $ 27,856 $ 23,694 $ 78,375 $ 51,550
Allocation of net income for basic:            
Allocation of net income for basic common stock $ 60,141   $ 27,856   $ 78,375 $ 51,550
Weighted average number of shares for basic:            
Weighted-average number of common shares — basic 12,196   11,672   12,177 11,654
Net income per share for basic:            
Net income per common share — basic $ 4.93   $ 2.39   $ 6.44 $ 4.42
Common Class A            
Allocation of net income for basic:            
Allocation of net income for basic common stock $ 47,930   $ 20,639   $ 61,612 $ 38,161
Weighted average number of shares for basic:            
Weighted-average number of common shares — basic 9,720   8,648   9,572 8,627
Net income per share for basic:            
Net income per common share — basic $ 4.93   $ 2.39   $ 6.44 $ 4.42
Common Class B            
Allocation of net income for basic:            
Allocation of net income for basic common stock $ 11,836   $ 6,964   $ 16,237 $ 12,908
Weighted average number of shares for basic:            
Weighted-average number of common shares — basic 2,400   2,918   2,523 2,918
Net income per share for basic:            
Net income per common share — basic $ 4.93   $ 2.39   $ 6.44 $ 4.42
Unvested participating shares            
Allocation of net income for basic:            
Allocation of net income for basic unvested participating shares $ 375   $ 253   $ 526 $ 481
Weighted average number of shares for basic:            
Weighted-average number of common shares — basic 76   106   82 109