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Financial Instruments - Carrying Amount and Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 426,717 $ 634,897
Credit facilities and bank overdrafts 4,949 4,695
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 298,954 298,499
Reported Value Measurement | 2023 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 298,850 298,698
Reported Value Measurement | 2021 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 338,505 337,704
Reported Value Measurement | 2024 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 565,404 564,034
Reported Value Measurement | 2026 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 902,063 899,886
Reported Value Measurement | 2028 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 396,535 396,377
Reported Value Measurement | 2048 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 785,890 785,788
Reported Value Measurement | 2047 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 493,361 493,151
Reported Value Measurement | Term loan credit agreement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 324,370 349,163
Reported Value Measurement | Amortizing Note    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 103,968 125,007
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 426,717 634,897
Credit facilities and bank overdrafts 4,949 4,695
Derivative Asset 14,353 7,229
Derivative Liability 6,342 6,907
Estimate of Fair Value Measurement [Member] | 2020 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 303,208 300,356
Estimate of Fair Value Measurement [Member] | 2023 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 304,471 293,017
Estimate of Fair Value Measurement [Member] | 2021 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 344,904 341,094
Estimate of Fair Value Measurement [Member] | 2024 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 605,769 584,129
Estimate of Fair Value Measurement [Member] | 2026 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 967,456 909,439
Estimate of Fair Value Measurement [Member] | 2028 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 435,181 401,231
Estimate of Fair Value Measurement [Member] | 2048 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 887,584 783,925
Estimate of Fair Value Measurement [Member] | 2047 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 505,988 446,725
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 $ 106,715 $ 127,879