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Interest and Income Taxes Paid (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and Cash Equivalents [Line Items]      
Interest $ 19,656 $ 22,857 $ 30,609
Income Taxes $ 10,388 $ 8,500 $ 5,300