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. 25, 2022	Mar. 26, 2022	Jun. 26, 2021	Mar. 27, 2021	Jun. 25, 2022	Jun. 26, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 53,349	$ (1,955)	$ 59,195	$ 65,565	$ 51,394	$ 124,760
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 53,349		$ 59,195		$ 51,394	$ 124,760
Weighted average number of shares for basic:
Weighted-average number of common shares — basic	12,319		12,283		12,309	12,277
Net income per share for basic:
Net income per common share - basic	$ 4.33		$ 4.82		$ 4.18	$ 10.16
Common Class A
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 44,261		$ 48,710		$ 42,631	$ 102,354
Weighted average number of shares for basic:
Weighted-average number of common shares — basic	10,221		10,108		10,210	10,072
Net income per share for basic:
Net income per common share - basic	$ 4.33		$ 4.82		$ 4.18	$ 10.16
Common Class B
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 8,956		$ 10,268		$ 8,634	$ 21,893
Weighted average number of shares for basic:
Weighted-average number of common shares — basic	2,068		2,131		2,068	2,155
Net income per share for basic:
Net income per common share - basic	$ 4.33		$ 4.82		$ 4.18	$ 10.16
Unvested participating shares
Allocation of net income for basic:
Allocation of net income for basic unvested participating shares	$ 132		$ 217		$ 129	$ 513
Weighted average number of shares for basic:
Weighted-average number of common shares — basic	30		44		31	50