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Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (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
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,510 $ (813) $ 2,454 $ 588
Foreign currency translation (106) 16 (61) (1,339)
Unrealized gain (loss) on investments before reclassification, net of tax 27 (394) 33 (440)
Reclassification adjustment for net gain (loss) realized in net income, net of tax (2) 24 3 24
Ending Balance 2,429 (1,167) 2,429 (1,167)
Net Unrealized Gain (Loss) on Marketable Investments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 27 (1,070) 16 (1,024)
Unrealized gain (loss) on investments before reclassification, net of tax 27 (394) 33 (440)
Reclassification adjustment for net gain (loss) realized in net income, net of tax (2) 24 3 24
Ending Balance 52 (1,440) 52 (1,440)
Cumulative Translation Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 2,483 257 2,438 1,612
Foreign currency translation (106) 16 (61) (1,339)
Ending Balance $ 2,377 $ 273 $ 2,377 $ 273