Annual report pursuant to Section 13 and 15(d)

Investments in Unrealized Loss Position, Determined to be Temporarily Impaired (Detail)

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Investments in Unrealized Loss Position, Determined to be Temporarily Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Fair Value  
Less than one year $ 15,407
Greater than one year 1,542
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total 16,949
Unrealized Losses  
Less than one year 27
Greater than one year 6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses, Total $ 33