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Debt - Long-term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Oct. 31, 2016
Aug. 31, 2015
Jun. 30, 2015
Sep. 30, 2014
Dec. 31, 2011
Debt Instrument [Line Items]                
Less: Debt issuance costs $ (5,919)   $ (6,007)          
Total debt, net 2,544,241   2,413,725          
Less: Current portion, net (315,093)   (132,284)          
Total long-term debt, net 2,229,148   2,281,441          
Interest rate on senior notes       1.53%        
U.S. dollar 3.73% senior notes due September 2024                
Debt Instrument [Line Items]                
Total debt, gross 300,000   300,000          
Interest rate on senior notes             3.73%  
U.S. dollar 3.91% senior notes due June 2025                
Debt Instrument [Line Items]                
Total debt, gross 50,000   50,000          
Interest rate on senior notes           3.91%    
U.S. dollar 3.96% senior notes due August 2025                
Debt Instrument [Line Items]                
Total debt, gross 100,000   100,000          
Interest rate on senior notes         3.96%      
U.S. dollar 4.18% senior notes due December 2025                
Debt Instrument [Line Items]                
Total debt, gross $ 275,000   275,000          
Interest rate on senior notes 4.18%              
U.S. dollar 3.83% senior notes due September 2026                
Debt Instrument [Line Items]                
Total debt, gross $ 100,000   100,000          
Interest rate on senior notes             3.83%  
U.S. dollar 4.32% senior notes due December 2027                
Debt Instrument [Line Items]                
Total debt, gross $ 250,000   250,000          
Interest rate on senior notes 4.32%              
U.S. dollar 4.37% senior notes due December 2028                
Debt Instrument [Line Items]                
Total debt, gross $ 50,000   50,000          
Interest rate on senior notes 4.37%              
U.S. dollar 3.98% senior notes due September 2029                
Debt Instrument [Line Items]                
Total debt, gross $ 100,000   100,000          
Interest rate on senior notes             3.98%  
U.S. dollar 4.45% senior notes due August 2035                
Debt Instrument [Line Items]                
Total debt, gross 50,000   50,000          
Interest rate on senior notes         4.45%      
British pound 4.68% senior note due September 2020                
Debt Instrument [Line Items]                
Interest rate on senior notes   4.68%            
British pound 2.59% senior note due November 2028                
Debt Instrument [Line Items]                
Total debt, gross $ 203,046   204,880          
Interest rate on senior notes 2.59%              
British pound 2.70% senior note due November 2031                
Debt Instrument [Line Items]                
Total debt, gross $ 101,510   102,433          
Interest rate on senior notes 2.70%              
Euro 1.34% senior notes due October 2026                
Debt Instrument [Line Items]                
Total debt, gross $ 341,284   366,806          
Interest rate on senior notes 1.34%              
Euro 1.71% senior notes due December 2027                
Debt Instrument [Line Items]                
Total debt, gross $ 85,323   91,706          
Interest rate on senior notes 1.71%              
Euro 1.53% senior notes due October 2028                
Debt Instrument [Line Items]                
Total debt, gross $ 227,541   244,572          
Interest rate on senior notes 1.53%              
Swiss franc 2.44% senior note due December 2021                
Debt Instrument [Line Items]                
Total debt, gross $ 0   62,190          
Interest rate on senior notes               2.44%
Revolving credit facility borrowings                
Debt Instrument [Line Items]                
Total debt, gross 314,480   72,145          
Other, principally foreign                
Debt Instrument [Line Items]                
Total debt, gross $ 1,976   $ 0