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Cash Equivalents And Investments (Schedule Of Investments) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Investments [Line Items]
Short-Term	$ 5,765	$ 4,139
Long-Term	40,501	44,991
Municipal Debt Securities [Member]
Schedule of Investments [Line Items]
Short-Term	5,765	4,139
Long-Term	25,454	26,964
Federal Home Loan Securities [Member]
Schedule of Investments [Line Items]
Short-Term
Long-Term	965	18,027
Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Short-Term
Long-Term	$ 14,082

X

- Definition

This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities within one year of the balance sheet date or the normal operating cycle, whichever is longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

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