Product Warranty and Safety Recall Campaigns (Narrative) (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 24, 2017	Jun. 25, 2017	Dec. 31, 2016	Sep. 25, 2016	Jun. 26, 2016	Dec. 31, 2015
Product Information [Line Items]
Liability for recall campaigns	$ 70,807	$ 80,681	$ 79,482	$ 85,523	$ 82,480	$ 74,217
Recall Campaign
Product Information [Line Items]
Liability for recall campaigns	$ 6,200		$ 13,600	$ 19,500
Motorcycles | All Countries, Excluding Japan
Product Information [Line Items]
Standard product warranty, period (in years)	2 years
Motorcycles | Japan
Product Information [Line Items]
Standard product warranty, period (in years)	3 years
Parts and Accessories and General Merchandise
Product Information [Line Items]
Standard product warranty, period (in years)	1 year