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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other Comprehensive Income Loss Tax Parenthetical Disclosures [Abstract]        
Tax on Unrealized gain (loss) on investments before reclassification $ 27 $ 238 $ 27 $ 241
Tax on Reclassification adjustment for net gain (loss) realized in net income $ 2 $ 15 $ 2 $ 15