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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other Comprehensive Income Loss Tax Parenthetical Disclosures [Abstract]    
Tax on Unrealized gain (loss) on investments before reclassification $ 0 $ 3
Tax on Reclassification adjustment for net loss realized in net income $ 0