Investment in Other Affiliates (Detail) (USD $)	12 Months Ended				12 Months Ended	14 Months Ended							12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2013 Brammo, Inc.	Dec. 31, 2013 Eicher -Polaris Private Limited	Dec. 31, 2013 Eicher -Polaris Private Limited	Dec. 31, 2013 Brammo, Inc.	Dec. 31, 2012 Brammo, Inc.	Dec. 31, 2013 Eicher -Polaris Private Limited	Dec. 31, 2012 Eicher -Polaris Private Limited	Dec. 31, 2013 Other affiliates	Dec. 31, 2012 Other affiliates	Dec. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] Brammo, Inc.
Investments in and Advances to Affiliates [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures				$ 2,500,000			$ 9,500,000	$ 12,000,000	$ 6,456,000	$ 817,000	$ 15,956,000	$ 12,817,000
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
Payments for (Proceeds from) Investments						9,433,000
Equity in loss of other affiliates	(2,414,000)	(179,000)	0
Cost-method Investments, Other than Temporary Impairment													$ 5,000,000