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Short-term Investment - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities in a gross unrealized loss position, maturities term	12 months
Other-than-temporary impairments considered	$ 0

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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