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Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($)
Sep. 30, 2015
Jan. 15, 2015
Dec. 31, 2014
Apr. 16, 2014
Debt Instrument [Line Items]        
Total current portion of long-term debt $ 41,250,000   $ 45,625,000  
Total notes 623,589,000   623,471,000  
Long-term credit agreements 495,000,000   529,375,000 $ 25,000,000.0
Total long-term debt 1,118,589,000   1,152,846,000  
Current portion of long-term debt 41,250,000   45,625,000  
Total debt 1,159,839,000   1,198,471,000  
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015        
Debt Instrument [Line Items]        
Current portion of senior notes 0 $ 25,000,000 25,000,000  
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016        
Debt Instrument [Line Items]        
Total notes 25,000,000   25,000,000  
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018        
Debt Instrument [Line Items]        
Total notes 100,000,000   100,000,000  
4.200% senior notes, semi-annual interest payments, balloon due 2024        
Debt Instrument [Line Items]        
Total notes 498,589,000   498,471,000  
5-year term-loan facility, periodic interest and principal payments, currently LIBOR plus 1.375%, expires May 20, 2019        
Debt Instrument [Line Items]        
Current portion of loan facility 41,250,000   20,625,000  
Long-term credit agreements 495,000,000   529,375,000  
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus 1.175%, plus commitment fees of 0.20%, expires May 20, 2019        
Debt Instrument [Line Items]        
Long-term credit agreements 0   0  
Revolving credit loan, quarterly interest payments, LIBOR plus up to 1.40% and availability fee up to 0.25%, expires December 31, 2016        
Debt Instrument [Line Items]        
Long-term credit agreements $ 0   $ 0