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Derivative Instruments - Fair Values of Derivative Contracts Recorded in Consolidated Balance Sheets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified		12 Months Ended
	Mar. 31, 2012	Dec. 31, 2012 Cost of Sales [Member]
Derivatives, Fair Value [Line Items]
Strike price of put option exercised	1.445
Amounts of cost of sales offset		$ 0

The portion of gains on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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