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Accounts Payable and Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accounts Payable and Accrued Liabilities [Line Items]    
Trade accounts payable $ 65,040 $ 91,688
Accrued wages, salaries and employee benefits 37,430 42,066
Accrued taxes other than income taxes payable 11,257 10,249
Accrued utilities 7,265 8,514
Accrued discounts and allowances 5,588 4,981
Accrued interest 5,245 5,977
Accrued transportation 3,801 3,337
Other 9,005 17,792
Accounts payable and accrued liabilities $ 144,631 $ 184,604