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Long-Term Debt - Long-Term Debt Instrument (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Mar. 11, 2019
Sep. 18, 2014
Debt Instrument [Line Items]        
Document Period End Date Jun. 30, 2019      
Total current portion of long-term debt $ 55,000 $ 50,000    
Total notes 848,636 499,101    
Long-term credit agreements 587,500 965,000    
Debt Issuance Costs, Gross (9,359) (7,111)    
Total long-term debt 1,426,777 1,456,990    
Current portion of long-term debt 55,000 50,000    
Total debt 1,481,777 1,506,990    
Notes Payable, Current 15,000 15,000    
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024        
Debt Instrument [Line Items]        
Total notes 499,180 499,101    
Four Point Five Zero Zero Percent Senior Notes Due Two Thousand Twenty Nine [Member]        
Debt Instrument [Line Items]        
Total notes 350,000   $ 350,000  
Debt Instrument, Unamortized Discount (Premium), Net 349,456      
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 40,000 35,000    
Long-term credit agreements 310,000 330,000    
5-year revolving-loan facility, periodic interest payments, 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 0 350,000    
Revolving Credit Loan Expires In Two Thousand Sixteen [Member]        
Debt Instrument [Line Items]        
Long-term credit agreements $ 277,500 $ 285,000    
Minimum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.00%      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Long-term credit agreements       $ 475,000
Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.50% 1.50%