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Merchandise Inventories - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Merchandise inventories $ 990,193 $ 916,311
LIFO Inventory Amount 964,200 902,200
Current costs or first-in, first-out (FIFO) excess of replacement over stated LIFO value 119,600 115,400
Raw Materials 22,100 19,700
Work in Process $ 7,000 $ 10,800