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Estimated Fair Value of Outstanding Debt Balances (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Carrying value of Debt $ 685,000 $ 692,500
Fair value of Debt 709,727 683,565
Term Loan Facility
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Carrying value of Debt 85,000 92,500
Fair value of Debt 85,000 92,500
4.97% Series A Senior Notes, Due October 5th 2020
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Carrying value of Debt 300,000 300,000
Fair value of Debt 319,834 304,293
4.27% Series B Senior Notes, Due June 14th 2022
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Carrying value of Debt 300,000 300,000
Fair value of Debt $ 304,893 $ 286,772