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Income Taxes - Classification of Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Net deferred income tax assets | $ 12,252 | $ 450,618
Other noncurrent assets |  |
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Net deferred income tax assets | 76,750 | 508,363
Other noncurrent liabilities |  |
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Net deferred income tax assets | $ (64,498) | $ (57,745)

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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