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Fair Value of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Measurements [Line Items]    
Fair value of debt $ 1,543,402 $ 1,165,011
Quoted Prices In Active Markets (Level 1)
   
Fair Value Measurements [Line Items]    
Fair value of debt 899,390 782,377
Significant Other Observable Inputs (Level 2)
   
Fair Value Measurements [Line Items]    
Fair value of debt $ 644,012 $ 382,634