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Estimated Fair Value of Outstanding Debt Balances (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of Debt $ 690,000 $ 692,500
Fair value of Debt 705,277 683,565
Term Loan Facility
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of Debt 90,000 92,500
Fair value of Debt 90,000 92,500
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 316,398 304,293
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 $ 298,879 $ 286,772