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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items]
Available-for-sale and trading securities	$ 26,000
Derivative financial instruments, net	2,256
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items]
Available-for-sale and trading securities	26,000
Derivative financial instruments, net	0
Significant Other Observable Inputs (Level 2) [Member]
Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items]
Available-for-sale and trading securities	0
Derivative financial instruments, net	2,256
Significant Unobservable Inputs (Level 3) [Member]
Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items]
Available-for-sale and trading securities	0
Derivative financial instruments, net	$ 0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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