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Financial Instruments - Carrying Amount and Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, at fair value [1] $ 491,386 $ 323,992
Credit facilities and bank overdrafts [2] 38,720 13,599
Reported Value Measurement [Member] | Senior Notes 2007    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] 499,735 499,676
Reported Value Measurement [Member] | Senior Notes 2013    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] 298,519 297,986
Reported Value Measurement [Member] | Senior Notes 2016    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] 563,981 512,764
Reported Value Measurement [Member] | Senior Notes 2017    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] 492,877 0
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, at fair value [1] 491,386 323,992
Credit facilities and bank overdrafts [2] 38,720 13,599
Estimate of Fair Value Measurement [Member] | Senior Notes 2007    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] 551,713 556,222
Estimate of Fair Value Measurement [Member] | Senior Notes 2013    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] 306,361 302,376
Estimate of Fair Value Measurement [Member] | Senior Notes 2016    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] 611,397 546,006
Estimate of Fair Value Measurement [Member] | Senior Notes 2017    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent [3] $ 511,789 $ 0
[1] The carrying amount of cash and cash equivalents approximates fair value due to the short maturity of those instruments.
[2] The carrying amount of our credit facilities, bank overdrafts and commercial paper approximates fair value as the interest rate is reset frequently based on current market rates as well as the short maturity of those instruments.
[3] The fair value of our long-term debt was calculated using discounted cash flows applying current interest rates and current credit spreads based on our own credit risk.