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Available-For-Sale Securities (Schedule of Realized Gain (Loss)) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Available-for-sale Securities [Abstract]        
Realized gains $ 14 $ 99 $ 567 $ 154
Realized losses (38) (435) (67) (523)
Net realized (losses) gains (24) (336) 500 (369)
Other than temporary impairment charges 0 0 0 0
(Losses) gains on available-for-sale securities, net (24) (336) 500 (369)
Proceeds from sales of available-for-sale securities $ 498,501 $ 169,753 $ 1,134,033 $ 196,042