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Income Taxes - Classification of Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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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Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items]

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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

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Reference 1: 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=75116654&loc=d3e31931-109318

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-Name Accounting Standards Codification
-Topic 740
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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