Summary of Cost and Estimated Fair Values of Short Term Fixed Income Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Amortized Cost
Less than 1 year	$ 5,098
Due in 1 to 5 years	49,682
Total	54,780
Estimated Fair Value
Less than 1 year	5,097
Due in 1 to 5 years	49,552
Total	$ 54,649

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

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