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Marketable Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Marketable Securities [Abstract]        
Available-for-sale Securities, Gross Realized Gain (Loss) $ 0 $ 2 $ 96 $ 4
Investment Income, Amortization of Premium $ 348 $ 136 $ 693 $ 273