Investment in Other Affiliates Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		35 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 18,811		$ 18,811		$ 18,811	$ 14,601
Income (loss) from equity method investments	$ (1,345)	$ (1,036)	$ (4,716)	$ (2,899)
Eicher -Polaris Private Limited
Investments in and Advances to Affiliates [Line Items]
Equity method investment ownership percentage	50.00%		50.00%		50.00%
Period for proportionate share of income (loss) to be reflected in consolidated financials			1 month
Joint venture investment			$ 50,000
Investment Maturity Period			3 years
Payments to acquire businesses and interest in affiliates					$ 32,215