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Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Marketable Securities [Abstract]        
Available-for-sale Securities, Gross Realized Gain (Loss) $ 2 $ 38 $ 4 $ 127
Investment Income, Amortization of Premium $ 136 $ 173 $ 273 $ 360