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Investments - Summary of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]        
Sales proceeds (fair value) $ 53,961 $ 376 $ 126,748 $ 390
Gross realized gains 742 56 5,930 56
Gross realized losses (241)   (577) (1)
Other than temporary losses $ 0 $ 0 $ 0 $ 0