Restructuring Charges (Separation and Restructuring Plan Activity) (Detail) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
	Jul. 01, 2019	Dec. 31, 2019	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Liability beginning balance	$ 25,083	$ 25,083	$ 38,927
Increase in liability (separation and other charges)		1,952	8,870
Reduction in liability (payments and adjustments)		(1,109)	(22,714)
Liability ending balance	53	$ 896	$ 25,083
ASC 842
Restructuring Cost and Reserve [Line Items]
Reduction in liability from ASU implementation	$ (25,030)