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Investment in Other Affiliates (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments in and Advances to Affiliates [Line Items]      
Investments in and Advances to Affiliates, at Fair Value $ 6,133,000 $ 19,435,000  
Investment in finance affiliate 92,059,000 88,764,000  
Equity in loss of other affiliates (29,252,000) (6,760,000) $ (6,873,000)
Cost-method Investments, Realized Gains $ 13,000,000    
Eicher -Polaris Private Limited      
Investments in and Advances to Affiliates [Line Items]      
Equity method investment ownership percentage 50.00%    
Equity Method Investment, Other than Temporary Impairment $ 19,000,000    
Costs and Expenses 27,048,000    
Eicher -Polaris Private Limited      
Investments in and Advances to Affiliates [Line Items]      
Investment in finance affiliate $ 0 $ 18,616,000