Investments in Unconsolidated Affiliates - Summarized Financial Information Derived from Equity Method Investees' Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Balance sheet data [Abstract]
Current assets	$ 222,408		$ 222,408		$ 246,127
Noncurrent assets	112,547		112,547		139,200
Current liabilities	163,931		163,931		174,710
Noncurrent liabilities	60,112		60,112		$ 58,334
Income statement data [Abstract]
Net sales	131,827	$ 148,400	382,132	$ 407,300
Gross profit	18,140	21,500	41,989	56,700
Net loss	$ (5,007)	$ (788)	$ (22,867)	$ (3,492)