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Detail of Certain Balance Sheet Accounts - Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Summary of inventories
New vehicles	$ 1,303,397	$ 1,278,863
Used vehicles	343,033	350,219
Rental vehicles	143,372	142,926
Parts, accessories and other	79,629	80,556
Total inventories	1,869,431	1,852,564
Less: lower of cost or net realizable value allowance	8,524	8,505
Inventories, net	$ 1,860,907	$ 1,844,059

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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