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Investment in Other Affiliates (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items]        
Investments in and Advances to Affiliates, at Fair Value   $ 0 $ 6,133  
Investment in finance affiliate   110,641 92,059  
Equity in loss of other affiliates   $ (5,133) (29,252) $ (6,760)
Cost-method Investments, Realized Gains $ 13,478      
Eicher -Polaris Private Limited        
Investments in and Advances to Affiliates [Line Items]        
Costs and Expenses     $ 27,048