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Estimated Fair Value of Outstanding Debt Balances (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of Debt $ 692,500 $ 698,750
Fair value of Debt 683,565 738,622
Term Loan Facility
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of Debt 92,500 98,750
Fair value of Debt 92,500 98,750
4.97% Series A Senior Notes
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of Debt 300,000 300,000
Fair value of Debt 304,293 329,281
4.27% Series B Senior Notes
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of Debt 300,000 300,000
Fair value of Debt $ 286,772 $ 310,591