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Fair Value of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Fair Value Measurements [Line Items]  
Fair value of debt $ 1,187,605
Quoted Prices In Active Markets (Level 1)
 
Fair Value Measurements [Line Items]  
Fair value of debt 808,750
Significant Other Observable Inputs (Level 2)
 
Fair Value Measurements [Line Items]  
Fair value of debt $ 378,855