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Fair Value Measurements and Marketable Securities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair Value Measurements [Line Items]
Unrealized loss from marketable securities		$ 125,000	$ 82,000	$ 377,000
Proceeds from sales of available for sale of municipal bonds	1,100,000	3,134,000	15,971,000	5,760,000
Realized gains recorded in other income, investment and interest caption		$ 48,000	$ 224,000	$ 50,000

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period.

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