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Income Taxes - Classification of Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Net deferred income tax assets | $ 450,618 | $ 450,085
Other noncurrent assets |  |
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Net deferred income tax assets | 508,363 | 510,928
Other noncurrent liabilities |  |
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Net deferred income tax assets | $ (57,745) | $ (60,843)

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