Investments - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Sale of debt securities, realized gains	$ 0	$ 3,000
Sale of debt securities, realized losses	0	0
Recognized unrealized gains in accumulated other comprehensive income		2,000
Recognized unrealized losses in accumulated other comprehensive income		4,000
Other-than-temporary impairments before taxes		11,000
Auction rate municipal securities
Schedule of Available-for-sale Securities [Line Items]
Auction rate securities, par value		$ 1,100,000
Maturity dates for auction rate securities range, low		2030
Maturity dates for auction rate securities range, high		2036

Available for sale securities debt maturities year maximum.

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Available for sale securities debt maturities year minimum.

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Recognized unrealized gains in accumulated other comprehensive income.

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Recognized unrealized losses in accumulated other comprehensive income.

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Amount of par or stated value of auction preferred securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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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 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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