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Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total long-term debt $ 438,581 $ 250,000
Less current portion      
Long-term debt, net of current portion 438,581 250,000
5.375% Notes, Due Oct. 2020 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 250,000 250,000
2.05% Term Loan, Due Mar. 2023 [Member]
   
Debt Instrument [Line Items]    
Total long-term debt 57,641  
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Total long-term debt $ 130,940