Investment in Other Affiliates (Detail) (USD $)	3 Months Ended			17 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Eicher -Polaris Private Limited	Mar. 31, 2014 Eicher -Polaris Private Limited	Mar. 31, 2014 Brammo, Inc.	Dec. 31, 2013 Brammo, Inc.	Mar. 31, 2014 Eicher -Polaris Private Limited	Dec. 31, 2013 Eicher -Polaris Private Limited	Mar. 31, 2014 Other affiliates	Dec. 31, 2013 Other affiliates
Investments in and Advances to Affiliates [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures					$ 9,500,000	$ 9,500,000	$ 5,602,000	$ 6,456,000	$ 15,102,000	$ 15,956,000
Equity method investment ownership percentage			50.00%	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				9,433,000
Income (Loss) from Equity Method Investments	$ (896,000)	$ (412,000)