Information Related to Effect of Derivative Instrument's on Our Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		$ (1,762)	$ (3,000)
Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ 9,949		9,949
Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		77	(848)
Other comprehensive (loss) income | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(1,395)	10
Other comprehensive (loss) income | Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		743	(725)
Product revenues | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives			(1,102)
Cost of sales | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(608)	(1,782)
Cost of sales | Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(666)	(123)
Selling, general and administrative expense | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		139	(477)
Foreign currency gain | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		$ 102	351
Gain on Settlement of Derivatives | Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives			$ 9,949