Additional Balance Sheet and Cash Flow Information (Inventories, Net) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Apr. 01, 2018
Inventory
Raw materials and work in process	$ 204,759	$ 177,110	$ 177,652
Inventory at lower of FIFO cost or net realizable value	654,445	614,767	616,926
Excess of FIFO over LIFO cost	(58,639)	(58,639)	(52,355)
Inventories, net	595,806	556,128	564,571
Motorcycles
Inventory
Finished goods	304,386	301,630	289,046
Parts and Accessories and General Merchandise
Inventory
Finished goods	$ 145,300	$ 136,027	$ 150,228

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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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 by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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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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