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Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
May 10, 2018
Dec. 31, 2017
Dec. 22, 2016
Sep. 15, 2011
Debt Instrument [Line Items]          
Long-term Debt, Maturities, Repayments of Principal in Year Five $ 210,000,000.0        
Document Period End Date Dec. 31, 2018        
Total current portion of long-term debt $ 50,000,000   $ 120,000,000    
Total notes 499,101,000   498,943,000    
Long-term credit agreements 965,000,000   365,000,000    
Debt Issuance Costs, Net (7,111,000)   (7,802,000)    
Total long-term debt 1,456,990,000   856,141,000    
Current portion of long-term debt 50,000,000   120,000,000    
Total debt 1,506,990,000   976,141,000    
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015          
Debt Instrument [Line Items]          
Current portion of senior notes       $ 25,000,000.0  
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016          
Debt Instrument [Line Items]          
Current portion of senior notes 0   100,000,000    
4.200% Senior Notes, semi-annual interest payments, balloon due 2024          
Debt Instrument [Line Items]          
Total notes 499,101,000   498,943,000    
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022          
Debt Instrument [Line Items]          
Current portion of loan facility 35,000,000   20,000,000    
Long-term credit agreements 330,000,000   365,000,000    
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022          
Debt Instrument [Line Items]          
Long-term credit agreements 350,000,000   0    
Five Year Term Loan Facility Expires in Two Thousand Twenty Three [Member]          
Debt Instrument [Line Items]          
Current portion of loan facility 15,000,000   0    
Long-term credit agreements $ 285,000,000   $ 0    
Master Agreement [Member] | Series E [Member]          
Debt Instrument [Line Items]          
Unsecured Debt   $ 100,000,000.0     $ 100,000,000.0