Restructuring Expense (Restructuring Plan Reserve Recorded in Accrued Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Restructuring Reserve [Roll Forward]
Restructuring expense	$ 0	$ (5,297)	$ 0	$ (2,359)
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				(1,533)
Motorcycles [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	0	(5,297)	0	(2,359)
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				(1,283)
Utilized—non-cash				0
Non-cash reserve release				(376)
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
Non-cash reserve release				0
Motorcycles [Member] | 2011 New Castalloy Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period				9,306
Restructuring expense				860
Utilized—cash				(4,019)
Utilized—non-cash				0
Non-cash reserve release				(5,250)
Motorcycles [Member] | 2011 New Castalloy Restructuring Plan [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period				145
Restructuring expense				577
Utilized—cash				(589)
Utilized—non-cash				0
Non-cash reserve release				0
Motorcycles [Member] | 2011 New Castalloy Restructuring Plan [Member] | Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period				0
Restructuring expense				2,093
Utilized—cash				0
Utilized—non-cash				(2,093)
Non-cash reserve release				0
Motorcycles [Member] | 2010 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period				10,156
Restructuring expense				0
Utilized—cash				(9,710)
Non-cash reserve release				(336)
Balance, end of period		110		110
Motorcycles [Member] | 2009 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period				5,357
Restructuring expense				1,606
Utilized—cash				(3,204)
Balance, end of period		2,226		2,226
Motorcycles [Member] | 2009 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period				5,196
Restructuring expense				0
Utilized—cash				(1,613)
Non-cash reserve release				(1,533)
Balance, end of period		2,050		2,050
Motorcycles [Member] | 2009 Restructuring Plan [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period				161
Restructuring expense				1,606
Utilized—cash				(1,591)
Non-cash reserve release				0
Balance, end of period		176		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		$ 0