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Restructuring Expense (Restructuring Plan Reserve Recorded in Accrued Liabilities Related to 2011 Plan) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2012
2011 Kansas City Restructuring Plan [Member]
Motorcycles And Related Products [Member]
Sep. 25, 2011
2011 Kansas City Restructuring Plan [Member]
Motorcycles And Related Products [Member]
Sep. 30, 2012
2011 Kansas City Restructuring Plan [Member]
Employee Serverance And Termination Costs [Member]
Motorcycles And Related Products [Member]
Sep. 25, 2011
2011 Kansas City Restructuring Plan [Member]
Employee Serverance And Termination Costs [Member]
Motorcycles And Related Products [Member]
Sep. 30, 2012
2011 Kansas City Restructuring Plan [Member]
Other [Member]
Motorcycles And Related Products [Member]
Sep. 25, 2011
2011 Kansas City Restructuring Plan [Member]
Other [Member]
Motorcycles And Related Products [Member]
Sep. 30, 2012
2011 New Castalloy Restructuring Plan [Member]
Motorcycles And Related Products [Member]
Sep. 30, 2012
2011 New Castalloy Restructuring Plan [Member]
Employee Serverance And Termination Costs [Member]
Motorcycles And Related Products [Member]
Sep. 30, 2012
2011 New Castalloy Restructuring Plan [Member]
Other [Member]
Motorcycles And Related Products [Member]
Sep. 30, 2012
2011 New Castalloy Restructuring Plan [Member]
Accelerated Depreciation [Member]
Motorcycles And Related Products [Member]
Sep. 30, 2012
2011 Restructuring Plan [Member]
Motorcycles And Related Products [Member]
Restructuring Cost and Reserve [Line Items]                        
Balance, beginning of period   $ 4,123   $ 4,123   $ 0   $ 8,733 $ 8,428 $ 305 $ 0 $ 12,856
Restructuring expense   0 8,161 0 7,819 0 342 9,677 2,450 1,075 6,152 9,677
Utilized-cash   0 4,290 0 3,948 0 342 1,623 388 1,235 0 1,623
Utilized-noncash   0 236 0 236 0 0 6,152 0 0 6,152 6,152
Noncash reserve release 43,500 (967)   (967)   0   0 0 0 0 (967)
Balance, end of period   $ 3,156 $ 3,635 $ 3,156 $ 3,635 $ 0 $ 0 $ 10,635 $ 10,490 $ 145 $ 0 $ 13,791