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Credit Facilities - Outstanding Amount of Credit Facilities (Detail)
12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 30, 2017
USD ($)
Line of Credit Facility [Line Items]        
Long-term debt   $ 1,466,803,000 $ 1,506,400,000  
Total unsecured debt   3,147,487,000 3,249,850,000  
Unamortized debt issuance costs   (4,207,000) (4,841,000)  
Total debt   3,143,280,000 3,245,009,000  
Less debt due within one year   711,147,000 694,989,000  
Long-term debt, excluding current portion   2,432,133,000 2,550,020,000  
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   1,500,000,000    
Debt instrument basis spread on variable rate 1.375%      
Term Loan [Member]        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   1,100,000,000    
Debt instrument basis spread on variable rate 1.375%      
Series G Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   50,000,000 50,000,000  
Debt instrument, face amount   $ 50,000,000    
Debt instrument, stated percentage 2.64% 2.64%    
Series F Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   $ 250,000,000 250,000,000  
Debt instrument, face amount   $ 250,000,000    
Debt instrument, stated percentage 3.24% 3.24%    
Series J Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   $ 257,468,000 269,955,000  
Debt instrument, face amount | € € 225,000,000      
Debt instrument, stated percentage 1.40% 1.40%    
Series H Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   $ 250,000,000 250,000,000  
Debt instrument, face amount   $ 250,000,000    
Debt instrument, stated percentage 3.24% 3.24%    
Series K Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   $ 286,075,000 299,950,000  
Debt instrument, face amount | € € 250,000,000      
Debt instrument, stated percentage 1.81% 1.81%    
Series I Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   $ 120,000,000 120,000,000  
Debt instrument, face amount   $ 120,000,000    
Debt instrument, stated percentage 3.70% 3.70%    
Series L Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   $ 143,038,000 149,975,000  
Debt instrument, face amount | € € 125,000,000      
Debt instrument, stated percentage 2.02% 2.02%    
Series M Senior Unsecured Notes [Member]        
Line of Credit Facility [Line Items]        
Long-term debt   $ 114,430,000 119,980,000  
Debt instrument, face amount | € € 100,000,000,000      
Debt instrument, stated percentage 2.32% 2.32%    
Other Unsecured Debt [Member]        
Line of Credit Facility [Line Items]        
Unsecured debt   $ 27,093,000 49,990,000  
Syndicated Facility [Member]        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity       $ 2,600,000,000
Syndicated Facility [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit, current   604,383,000 590,000,000  
Maximum borrowing capacity       1,500,000,000
Syndicated Facility [Member] | Term Loan [Member]        
Line of Credit Facility [Line Items]        
Unsecured debt   $ 1,045,000,000 $ 1,100,000,000  
Maximum borrowing capacity       $ 1,100,000,000