Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		$ 9,141	$ 7,606	$ 4,448
Additions charged to costs, expenses and as reductions to net sales		9,769	9,964	4,464
Deductions		5,128	8,429	1,306
Balance at end of year		13,782	9,141	7,606
Deferred Income Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		5,899	4,337	1,618
Adjustment for federal tax legislation	[1]			2,419
Additions charged to costs, expenses and as reductions to net sales		1,291	1,562	877
Deductions credited to expense				577
Balance at end of year		$ 7,190	$ 5,899	$ 4,337

[1] In 2017, the Company increased its valuation allowance as a result of the deductibility of certain deferred compensation based on the current interpretation of the Tax Act.