Investments in an Unrealized Loss Position, Determined to be Temporarily Impaired (Detail) (USD $) In Thousands	Jun. 30, 2011
Fair Value
Less than one year	$ 3,561
Greater than one year	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	3,561
Unrealized Losses
Less than one year	58
Greater than one year	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	$ 58

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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- Definition

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