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Long-term Debt - Summary of Long-Term Debt Instruments and Balances Outstanding Including Maturity Date, Weighted Average Interest Rate and Borrowing Capacity (Parenthetical) (Detail)
$ in Millions, $ in Millions
Sep. 30, 2021
USD ($)
Sep. 30, 2021
AUD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Revolving Credit Facility        
Debt Instrument [Line Items]        
Letters of credit outstanding amount $ 0.8   $ 1.0 $ 1.0
Local Currency Borrowing Capacity        
Debt Instrument [Line Items]        
Borrowing capacity   $ 80.6    
Principal outstanding   $ 47.9