Capital Transactions - Summary of the Awards Each Year (Detail) - Class B Common Stock [Member] - shares	9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016
Schedule of Capitalization, Equity [Line Items]
Date of approval for award	Mar. 07, 2017	Mar. 08, 2016
Fiscal year of service covered by award	2016	2015
Shares settled in cash to satisfy tax withholding obligations	18,980	19,080
Class B common stock shares issued	21,020	20,920
Total Class B Common Stock awarded	40,000	40,000