Investment in Other Affiliates Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		44 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items]
Investments in and advances to affiliates	$ 20,196		$ 20,196			$ 18,884
Income (loss) from equity method investments	$ (1,798)	$ (1,345)	$ (5,439)	$ (4,716)
Eicher -Polaris Private Limited
Investments in and Advances to Affiliates [Line Items]
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
Investment Maturity Period			3 years
Payments to acquire businesses and interest in affiliates					$ 41,560