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Long-Term Debt Aggregate Maturities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Long Term Debt Maturities Repayments Of Principal [Line Items]    
2013 $ 2,589 $ 2,479
2014 2,012  
2015 68,588  
2016 3,382,793  
2017 1,262  
Later 272,776  
Total $ 3,730,020 $ 3,653,907