Goodwill and Intangible Assets (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Goodwill [Roll Forward]
Goodwill, Beginning Balance			$ 54,182,000
Goodwill, Ending Balance	$ 54,663,000	$ 54,267,000	54,663,000	$ 54,267,000
Operating Segments | Motorcycles
Goodwill [Roll Forward]
Goodwill, Beginning Balance	54,542,000	26,105,000	54,182,000	27,752,000
Goodwill, Acquired During Period	0	28,567,000	0	28,567,000
Currency translations	(121,000)	405,000	481,000	(2,052,000)
Goodwill, Ending Balance	$ 54,663,000	$ 54,267,000	$ 54,663,000	$ 54,267,000