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Investment in Other Affiliates (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments in and Advances to Affiliates, at Fair Value |  | $ 7,500 |  |
Investment in finance affiliate |  | 59,400 | $ 110,600 |
Equity in loss of other affiliates |  | $ 0 | $ (5,100) | $ (29,300)
Cost-method Investments, Realized Gains | $ 13,500 |  |  |
Eicher -Polaris Private Limited |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Interest and operating expenses |  |  |  | $ 27,000

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