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Financial Instruments - Carrying Amount and Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 483,504 $ 634,897
Credit facilities and bank overdrafts 8,231  
Derivative Asset 0 0
Derivative Liability 0 0
Reported Value Measurement | 2020 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 298,743 298,499
Reported Value Measurement | 2023 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 298,774 298,698
Reported Value Measurement | 2021 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 334,486 337,704
Reported Value Measurement | 2024 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 558,869 564,034
Reported Value Measurement | 2026 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 891,757 899,886
Reported Value Measurement | 2028 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 396,460 396,377
Reported Value Measurement | 2048 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 785,838  
Reported Value Measurement | 2047 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 493,256 493,151
Reported Value Measurement | Term loan credit agreement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 324,295 349,163
Reported Value Measurement | Amortizing Note    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 114,667 125,007
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 483,504 634,897
Credit facilities and bank overdrafts 8,231  
Derivative Asset 21,296 7,229
Derivative Liability 3,220 6,907
Estimate of Fair Value Measurement [Member] | 2020 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 299,291 300,356
Estimate of Fair Value Measurement [Member] | 2023 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 298,642 293,017
Estimate of Fair Value Measurement [Member] | 2021 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 340,073 341,094
Estimate of Fair Value Measurement [Member] | 2024 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 596,056 584,129
Estimate of Fair Value Measurement [Member] | 2026 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 934,385 909,439
Estimate of Fair Value Measurement [Member] | 2028 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 414,879 401,231
Estimate of Fair Value Measurement [Member] | 2048 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 828,682  
Estimate of Fair Value Measurement [Member] | 2047 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 472,958 446,725
Estimate of Fair Value Measurement [Member] | Term loan credit agreement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 325,000 350,000
Estimate of Fair Value Measurement [Member] | Amortizing Note    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent $ 117,579 $ 127,879