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Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Parenthetical) (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
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]        
Tax on Unrealized gain (loss) on investments before reclassification $ 33 $ 143 $ 6 $ 98
Tax on Reclassification adjustment for net gain (losses) realized in net income $ 5 $ 4 $ 7 $ 11