Capital Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Mar. 08, 2016	Mar. 03, 2015	Apr. 03, 2016	Mar. 29, 2015	Oct. 02, 2016	Sep. 27, 2015	Sep. 30, 2016	Sep. 25, 2015
Schedule of Capitalization, Equity [Line Items]
Performance Unit Award Agreement expense recognized					$ 4,445	$ 5,674
Share price							$ 148.16	$ 189.13
Class B Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Performance units awarded	40,000	40,000
Performance units awards settled in cash	19,080	19,080
Increase in total number of shares outstanding			20,920	20,920	20,920	20,920