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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

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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 41, 42 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31917-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31958-109318 + Details
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