Information Related to Recurring Fair Value Measurement of Derivative Financial Instruments in Our Consolidated Balance Sheet (Detail) - Fair Value, Inputs, Level 2 - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commodity Derivatives | Cash Flow Hedge | Current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value	$ (725)
Net Asset/(Liabilities)	$ (725)
Currency Related Swap | Not a Hedge
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value		$ (9,164)
Net Asset/(Liabilities)		(9,164)
Currency Related Swap | Not a Hedge | Current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value		(2,466)
Currency Related Swap | Not a Hedge | Noncurrent Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value		(6,698)
Foreign Currency Derivatives | Not a Hedge
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)		1,490
Asset Derivatives, Fair Value		1,490
Foreign Currency Derivatives | Not a Hedge | Current Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		145
Foreign Currency Derivatives | Not a Hedge | Noncurrent Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		$ 1,345