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Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Amortization of deferred finance costs $ 1.0 $ 0.7 $ 0.6
Net cash outflows in respect of refinancing costs $ 1.5 $ 0.0 $ 0.0