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Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Operating Loss Carryforwards [Line Items]    
Carry forward tax losses $ 249,270 $ 263,085
Deferred revenues 4,221 3,862
Current deferred tax liability, net (8,546) (6,362)
Employee stock based compensation 15,642 15,105
Non-current deferred tax asset, net 25,553 25,296
Accrued employee costs 4,825 5,317
Non-current deferred tax liability   (1,274)
Reserves and allowances 2,540 2,238
Property and equipment 1,254 1,404
Marketable securities amortization 4,962 3,202
Intangible assets 5,794 7,218
Tax credits 2,618 2,213
Deferred tax assets before valuation allowance 291,126 303,644
Valuation allowance (246,785) (260,251)
Deferred tax asset 44,341 43,393
Intangible assets (7,927) (8,706)
Unrealized gains on marketable securities, net (4,428) (3,876)
Other (783) (509)
Deferred tax liability (13,138) (13,091)
Deferred tax asset, net 31,203 30,302
Domestic Tax Authority
    
Operating Loss Carryforwards [Line Items]    
Current deferred tax asset, net 4,862 4,240
Current deferred tax liability, net (2,799) (2,280)
Non-current deferred tax asset, net 14,403 14,616
Deferred tax asset, net 16,466 16,576
Foreign Tax Authority
    
Operating Loss Carryforwards [Line Items]    
Current deferred tax asset, net 9,334 8,402
Current deferred tax liability, net (5,747) (4,082)
Non-current deferred tax asset, net 11,150 10,680
Non-current deferred tax liability   (1,274)
Deferred tax asset, net $ 14,737 $ 13,726