Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments, Measured at Fair Value, Hedging Activities, and Concentrations of Credit Risk - Additional Information (Detail)

v3.20.2
Financial Instruments, Measured at Fair Value, Hedging Activities, and Concentrations of Credit Risk - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]      
Fair value of financing leases $ 15.2 $ 15.2 $ 15.7
Commodity Contracts [Member]      
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]      
Commodity derivative assets, notional amount 15.1 15.1  
Commodity derivative losses from hedging contracts sold, amount recognized $ 1.1 $ 1.1