Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		$ 4,448	$ 2,117	$ 1,330
Additions charged to costs and expenses		4,464	2,534	1,234
Deductions		1,306	203	447
Balance at end of year		7,606	4,448	2,117
Deferred Income Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		1,618	2,307	3,640
Adjustment for federal tax legislation	[1]	2,419
Additions charged to costs and expenses		877		28
Deductions credited to expense		577	689	1,361
Balance at end of year		$ 4,337	$ 1,618	$ 2,307

[1] (1) The recorded impact of the Tax Act is estimated and any final amount may differ, possibly materially, due to changes in estimates, interpretations and assumptions, changes in IRS interpretations, issuance of new guidance, legislative actions, changes in accounting standards or related interpretation in response to the Tax Act and future actions by states within the U.S.