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Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (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
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,429 $ (1,167) $ 2,454 $ 588
Foreign currency translation (2,333) 1,560 (2,394) 221
Unrealized gain (loss) on investments before reclassification, net of tax (51) 238 (18) (202)
Reclassification adjustment for net gain (losses) realized in net income, net of tax (8) (7) (5) 17
Ending Balance 37 624 37 624
Net Unrealized Gain (Loss) on Marketable Investments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 52 (1,440) 16 (1,024)
Unrealized gain (loss) on investments before reclassification, net of tax (51) 238 (18) (202)
Reclassification adjustment for net gain (losses) realized in net income, net of tax (8) (7) (5) 17
Ending Balance (7) (1,209) (7) (1,209)
Cumulative Translation Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 2,377 273 2,438 1,612
Foreign currency translation (2,333) 1,560 (2,394) 221
Ending Balance $ 44 $ 1,833 $ 44 $ 1,833