Net Income per Share - Additional Information (Detail)	3 Months Ended									12 Months Ended
	Dec. 31, 2016 shares $ / shares		Sep. 24, 2016 $ / shares	Jun. 25, 2016 $ / shares	Mar. 26, 2016 $ / shares	Dec. 26, 2015 $ / shares	Sep. 26, 2015 $ / shares	Jun. 27, 2015 $ / shares	Mar. 28, 2015 $ / shares	Dec. 31, 2016 shares $ / shares	Dec. 26, 2015 $ / shares shares	Dec. 27, 2014 $ / shares shares
Earnings Per Share Note [Line Items]
Net income per common share - basic | $ / shares	$ 1.77	[1]	$ 2.53	$ 2.11	$ 0.55	$ 1.25	$ 2.93	$ 2.24	$ 1.04	$ 6.93	$ 7.46	$ 6.96
Conversion ratio for Class B to Class A shares	1									1
Common Class A
Earnings Per Share Note [Line Items]
Net income per common share - basic | $ / shares										$ 6.93	$ 7.46	$ 6.96
Antidilutive securities excluded from computation of earnings per share										712,000	16,000	11,000
Common Class A | Performance-Based Awards
Earnings Per Share Note [Line Items]
Number of shares not included because the performance criteria was not expected to be met										35,000	15,000	30,000

[1] During the fourth quarter of 2016, the Company recorded a $3.6 million decrease in stock-based compensation expense related to the planned retirement of the Company's Chief Executive Officer in 2018.