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Marketable Securities - Additional Information (Detail) (USD $)	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses of available-for-sale securities fair value	$ 12,500,000
Aggregate fair value of available-for-sale securities	1,500,000
Aggregate unrealized loss of available-for-sale securities	$ 28,000

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References+ Details