Capital Transactions - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Vote Stock $ / shares	Jan. 01, 2017 USD ($) $ / shares	Jan. 03, 2016 USD ($) $ / shares
Schedule of Capitalization, Equity [Line Items]
Number of classes of common stock outstanding | Stock	2
Dividend is declared and paid on the Common Stock | $ / shares	$ 1.00	$ 1.00	$ 1.00
Payment of dividend | $	$ 9,328	$ 9,307	$ 9,287
Number of votes per share | Vote	1
Class B Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Dividend is declared and paid on the Common Stock | $ / shares	$ 1.00	$ 1.00	$ 1.00
Number of votes per share | Vote	20