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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Finished products $ 75,832 $ 67,713
Work in process 8,161 8,942
Raw materials and supplies 66,422 46,299
Total inventories 150,415 122,954
Excess of FIFO costs over LIFO costs 44,468 44,468
Total FIFO inventories $ 194,883 $ 167,422