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Investment in Other Affiliates Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended 32 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Jun. 30, 2015
Investments in and Advances to Affiliates [Line Items]            
Investments in and advances to affiliates $ 15,708   $ 15,708   $ 14,601 $ 15,708
Income (loss) from equity method investments $ (1,748) $ (967) $ (3,371) $ (1,863)    
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           $ 26,927