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Detail of Certain Balance Sheet Accounts - Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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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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