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Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 22, 2016
Apr. 16, 2014
Debt Instrument [Line Items]        
Total current portion of long-term debt $ 55,500,000 $ 73,125,000    
Total notes 598,785,000 598,628,000    
Long-term credit agreements 426,250,000 481,250,000   $ 25,000,000.0
Debt Issuance Costs, Net (6,663,000) (8,260,000)    
Total long-term debt 1,018,372,000 1,071,618,000    
Current portion of long-term debt 55,500,000 73,125,000    
Total debt 1,073,872,000 1,144,743,000    
Increase (Decrease) in Notes Payable, Current 500,000 0    
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015        
Debt Instrument [Line Items]        
Current portion of senior notes     $ 25,000,000  
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016        
Debt Instrument [Line Items]        
Current portion of senior notes 0 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 498,785,000 498,628,000    
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires May 20, 2019        
Debt Instrument [Line Items]        
Current portion of loan facility 55,000,000 48,125,000    
Long-term credit agreements 426,250,000 481,250,000    
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires May 20, 2019        
Debt Instrument [Line Items]        
Long-term credit agreements 0 0    
Revolving credit loan, quarterly interest payments, LIBOR plus up to 1.400% and availability fee up to 0.250%, expires December 31, 2016        
Debt Instrument [Line Items]        
Long-term credit agreements $ 0 $ 0