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Income Taxes - Expiration of Loss and Tax Credit Carryforwards (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Operating Loss and Tax Credit Carryforward [Line Items] |
Loss Carryforwards | $ 632,915
Tax Credit Carryforwards | 222,353
Period of Expiration 2017 - 2021 |
Operating Loss and Tax Credit Carryforward [Line Items] |
Loss Carryforwards | 39,939
Tax Credit Carryforwards | 7,085
Thereafter |
Operating Loss and Tax Credit Carryforward [Line Items] |
Loss Carryforwards | 317,915
Tax Credit Carryforwards | 193,867
No expiration date |
Operating Loss and Tax Credit Carryforward [Line Items] |
Loss Carryforwards | 275,061
Tax Credit Carryforwards | $ 21,401

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- Definition Operating Loss and Tax Credit Carryforward [Line Items] + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
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