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Cash Equivalents and Investments - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Short-Term	$ 5,535	$ 6,584
Long-Term	58,645	47,593
Municipal Debt Securities [Member]
Schedule of Investments [Line Items]
Short-Term	5,039	6,088
Long-Term	32,631	27,563
Federal Home Loan Securities [Member]
Schedule of Investments [Line Items]
Short-Term
Long-Term	24,553	18,569
Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Short-Term	496	496
Long-Term	$ 1,461	$ 1,461

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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