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. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Balance sheet data [Abstract]
Current assets	$ 222,036		$ 222,036		$ 228,214
Noncurrent assets	96,133		96,133		114,257
Current liabilities	171,642		171,642		175,371
Noncurrent liabilities	55,111		55,111		$ 57,216
Income statement data [Abstract]
Net sales	129,589	$ 131,827	362,978	$ 382,132
Gross profit	17,006	18,140	40,339	41,989
Net loss	$ (3,952)	$ (5,007)	$ (43,671)	$ (22,867)