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Capital Management - Additional Information (Detail)
$ in Millions
 12 Months Ended
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