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Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished products $ 84,075 $ 74,466
Work in process 10,264 8,108
Raw materials and supplies 57,453 54,263
Total inventories $ 151,792 $ 136,837