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Income Taxes - Expiration of Loss and Tax Credit Carryforwards (Detail) $ in Thousands | Dec. 31, 2016 USD ($)
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Operating Loss and Tax Credit Carryforward [Line Items] |
Loss carryforwards | $ 639,147
Tax credit carryforwards | 60,591
Period of Expiration 2017 - 2021 |
Operating Loss and Tax Credit Carryforward [Line Items] |
Loss carryforwards | 52,614
Tax credit carryforwards | 1,578
Period of Expiration Thereafter |
Operating Loss and Tax Credit Carryforward [Line Items] |
Loss carryforwards | 321,859
Tax credit carryforwards | 54,376
No Expiration Date |
Operating Loss and Tax Credit Carryforward [Line Items] |
Loss carryforwards | 264,674
Tax credit carryforwards | $ 4,637

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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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