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Inventories - Summary of Inventories, at LIFO Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished goods $ 23,775 $ 24,961
Raw materials 18,227 21,384
Total FIFO (first-in, first out) inventories 42,002 46,345
Reserve to adjust inventories to LIFO value (23,246) (23,241)
Total LIFO inventories $ 18,756 $ 23,104