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Accounting Policies and Basis of Presentation (Detail) - Inventory (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounting Policies [Abstract]    
Finished goods $ 16,770 $ 14,272
Barreled distillate 9,693 9,080
Raw materials 7,018 5,959
Work in process 2,647 2,571
Maintenance materials 4,421 4,116
Other 485 534
Total $ 41,034 $ 36,532