v3.10.0.1
Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - Dollar Denominated Revolving Credit Facilities [Member] - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings outstanding $ 0 $ 0
Revolving credit facility $ 600,000,000 $ 600,000,000