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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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