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Available for Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale equity securities, Cost $ 1,151 $ 28,265
Available-for-sale equity securities, Gross Unrealized Gains 137 1,981
Available-for-sale equity securities, Gross Unrealized Losses   (133) [1]
Available-for-sale equity securities, Fair Value $ 1,288 $ 30,113
[1] All unrealized loss positions were held at a loss for less than 12 months.