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Investment in Other Affiliates (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 21 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
|
Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Jun. 30, 2013
Brammo, Inc.
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Sep. 30, 2013
Eicher -Polaris Private Limited
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Sep. 30, 2013
Eicher -Polaris Private Limited
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Dec. 31, 2012
Eicher -Polaris Private Limited
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Sep. 30, 2013
Brammo, Inc.
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Dec. 31, 2012
Brammo, Inc.
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Sep. 30, 2013
Eicher -Polaris Private Limited
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Dec. 31, 2012
Eicher -Polaris Private Limited
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Sep. 30, 2013
Other affiliates
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Dec. 31, 2012
Other affiliates
|
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| Investments in and Advances to Affiliates [Line Items] | ||||||||||||||
| Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | $ 2,500,000 | $ 14,500,000 | $ 12,000,000 | $ 2,275,000 | $ 817,000 | $ 16,775,000 | $ 12,817,000 | |||||||
| Equity method investment ownership percentage | 50.00% | |||||||||||||
| Period for proportionate share of income (loss) to be reflected in consolidated financials | 1 month | |||||||||||||
| Joint venture investment | 50,000,000 | |||||||||||||
| Investment maturity period | 3 years | |||||||||||||
| Investment in affiliates | 4,562,000 | |||||||||||||
| Equity in loss of other affiliates | $ (631,000) | $ 0 | $ (1,629,000) | $ 0 | ||||||||||