Derivative Financial Instruments and Fair Value Measurement - Derivatives Recorded at Fair Value in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative assets	$ 644	$ 1,159
Derivative liabilities	31,797	41,301
Current [Member] | Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	644	1,159
Derivative liabilities	0	0
Current [Member] | Commodities contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivative liabilities	4,834	9,886
Current [Member] | Interest rate swap contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivative liabilities	17,219	17,562
Non Current [Member] | Interest rate swap contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivative liabilities	$ 9,744	$ 13,853