Restructuring Expense (Restructuring Plan Reserve Recorded in Accrued Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Restructuring Reserve [Roll Forward]
Restructuring expense	$ 0	$ 2,938
2011 Kansas City Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	6,000
2011 New Castalloy Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	22,100
2010 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	59,200
2009 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	393,800
Non-cash reserve release		(710)
Motorcycles [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	0	2,938
Motorcycles [Member] | 2011 Kansas City Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		2,259
Restructuring expense		0
Utilized—cash		0
Utilized—non-cash		(790)
Motorcycles [Member] | 2011 Kansas City Restructuring Plan [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		0
Restructuring expense		0
Utilized—cash		0
Utilized—non-cash		0
Motorcycles [Member] | 2011 New Castalloy Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		9,306
Restructuring expense		474
Utilized—cash		(1,416)
Utilized—non-cash		0
Motorcycles [Member] | 2011 New Castalloy Restructuring Plan [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		145
Restructuring expense		444
Utilized—cash		(456)
Utilized—non-cash		0
Motorcycles [Member] | 2011 New Castalloy Restructuring Plan [Member] | Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		0
Restructuring expense		2,092
Utilized—cash		0
Utilized—non-cash		(2,092)
Motorcycles [Member] | 2010 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		10,156
Restructuring expense		0
Utilized—cash		(9,607)
Balance, end of period		549
Motorcycles [Member] | 2009 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		5,357
Restructuring expense		638
Utilized—cash		(1,431)
Balance, end of period		3,854
Motorcycles [Member] | 2009 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		5,196
Restructuring expense		0
Utilized—cash		(808)
Non-cash reserve release		(710)
Balance, end of period		3,678
Motorcycles [Member] | 2009 Restructuring Plan [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		161
Restructuring expense		638
Utilized—cash		(623)
Non-cash reserve release		0
Balance, end of period		176
Motorcycles [Member] | 2009 Restructuring Plan [Member] | Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period		0
Restructuring expense		0
Utilized—cash		0
Non-cash reserve release		0
Balance, end of period		$ 0