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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other Comprehensive Income Loss Tax Parenthetical Disclosures [Abstract]        
Tax on Unrealized gain (loss) on investments before reclassification $ (33) $ 27 $ 29 $ 27
Tax on reclassification adjustment for net gain (loss) realized in net income   $ (2)   $ 2