Financial Instruments - Carrying Amount and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, at fair value	[1]	$ 498,730	$ 181,988
Credit facilities and bank overdrafts	[2]	13,112	142,178
Reported Value Measurement [Member] | Senior Notes 2006 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	0	124,964
Reported Value Measurement [Member] | Senior Notes 2007 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	499,638	499,618
Reported Value Measurement [Member] | Senior Notes 2013 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	297,916	297,683
Reported Value Measurement [Member] | Senior Notes 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	555,381	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]	498,730	181,988
Credit facilities and bank overdrafts	[2]	13,112	142,178
Estimate of Fair Value Measurement [Member] | Senior Notes 2006 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	0	127,717
Estimate of Fair Value Measurement [Member] | Senior Notes 2007 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	577,132	563,855
Estimate of Fair Value Measurement [Member] | Senior Notes 2013 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	316,742	290,830
Estimate of Fair Value Measurement [Member] | Senior Notes 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, Noncurrent	[3]	$ 604,035	$ 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 and bank overdrafts 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.