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Accrued Liabilities - Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accrued Liabilities Current [Abstract]    
Sales volume discounts payable $ 13,274 $ 13,940
Property taxes payable 1,490 2,937
Commissions payable 2,243 1,768
Accrued salaries 3,169 4,235
Other accrued liabilities 627 558
Total accrued liabilities $ 20,803 $ 23,438 [1]
[1] The consolidated balance sheet at December 31, 2012, as presented, is derived from the audited consolidated financial statements at that date.