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Capital Management - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Disclosure of financial assets [abstract] |
Term loan and revolving credit facility | $ 1,290
Ratio of net debt to adjusted EBITDA, long-term target description | Ratio of net debt to adjusted EBITDA of one times or lower
Ratio of net debt to adjusted EBITDA required for external borrowings description | Net debt to adjusted EBITDA ratio of 2.5 or below
Currency used for measurement of ratio | United States Dollar

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