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Accumulated Other Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (4,826) $ (1,613)
Foreign currency translation 1,481 (3,000)
Unrealized gain on investments, net of tax 117 98
Ending Balance (3,228) (4,515)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (100) (74)
Unrealized gain on investments, net of tax 117 98
Ending Balance 17 24
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (4,726) (1,539)
Foreign currency translation 1,481 (3,000)
Ending Balance $ (3,245) $ (4,539)