Net Income per Share - Computation of Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 67,263	$ 14,553	$ 191,960
Common shares, As reported - basic	12,317,000	12,280,000	12,204,000
EPS, As reported - basic	$ 5.46	$ 1.19	$ 15.73
Add: effect of dilutive potential common shares Share-based awards	56,000	138,000	153,000
Common Shares, Net effect of unvested participating shares		62
Earnings to Common Shareholders, Net effect of unvested participating shares	$ 1	$ 52	$ 14
Earnings to Common Shareholders, Net income per common share - diluted	$ 67,106	$ 14,553	$ 190,810
Common Shares, Net income per common share - diluted	12,345,000	12,436,000	12,283,000
EPS, Net income per common share — diluted	$ 5.44	$ 1.17	$ 15.53
Common Class A
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 55,812	$ 11,995	$ 153,106
Common shares, As reported - basic	10,221,000	10,121,000	9,734,000
EPS, As reported - basic	$ 5.46	$ 1.19	$ 15.73
Common Class B
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 11,293	$ 2,506	$ 37,690
Common shares, As reported - basic	2,068,000	2,115,000	2,396,000
EPS, As reported - basic	$ 5.46	$ 1.19	$ 15.73
Earnings to Common Shareholders, Class B Common Stock	$ 11,293	$ 2,506	$ 37,690
Class B Common Stock	2,068,000	2,115,000	2,396,000