Investment in Unconsolidated Affiliates - Summarized Financial Information Derived from Equity Method Investees' Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Balance sheet data [Abstract]
Current assets	$ 236,856		$ 236,856		$ 246,127
Noncurrent assets	127,783		127,783		139,200
Current liabilities	172,658		172,658		174,710
Noncurrent liabilities	58,214		58,214		$ 58,334
Income statement data [Abstract]
Net sales	126,205	$ 132,600	250,305	$ 258,900
Gross profit	11,749	19,600	23,849	35,200
Net income (loss)	$ 471	$ (217)	$ (17,860)	$ (2,704)