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Investment in Other Affiliates (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Brammo, Inc.
   
Investments in and Advances to Affiliates [Line Items]    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 9,500 $ 9,500
Eicher -Polaris Private Limited
   
Investments in and Advances to Affiliates [Line Items]    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 9,122 6,456
Other affiliates
   
Investments in and Advances to Affiliates [Line Items]    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 18,622 $ 15,956