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Financial Instruments - Carrying Amount and Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 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 $ 494,897 $ 634,897
Credit facilities and bank overdrafts 4,515 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 299,167 298,499
Reported Value Measurement | 2023 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 298,928 298,698
Reported Value Measurement | 2021 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 325,993 337,704
Reported Value Measurement | 2024 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 544,389 564,034
Reported Value Measurement | 2026 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 868,289 899,886
Reported Value Measurement | 2028 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 396,611 396,377
Reported Value Measurement | 2048 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 785,943 785,788
Reported Value Measurement | 2047 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 493,466 493,151
Reported Value Measurement | Term loan credit agreement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 282,493 349,163
Reported Value Measurement | Amortizing Note    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 93,106 125,007
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 494,897 634,897
Credit facilities and bank overdrafts 4,515 4,695
Derivative Asset 11,555 7,229
Derivative Liability 1,149 6,907
Estimate of Fair Value Measurement [Member] | 2020 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 303,360 300,356
Estimate of Fair Value Measurement [Member] | 2023 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 305,439 293,017
Estimate of Fair Value Measurement [Member] | 2021 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 331,248 341,094
Estimate of Fair Value Measurement [Member] | 2024 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 579,027 584,129
Estimate of Fair Value Measurement [Member] | 2026 Euro Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 929,034 909,439
Estimate of Fair Value Measurement [Member] | 2028 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 442,000 401,231
Estimate of Fair Value Measurement [Member] | 2048 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 907,008 783,925
Estimate of Fair Value Measurement [Member] | 2047 Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 515,700 446,725
Estimate of Fair Value Measurement [Member] | Term loan credit agreement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 283,000 350,000
Estimate of Fair Value Measurement [Member] | Amortizing Note    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent $ 95,985 $ 127,879