XML 38 R22.htm IDEA: XBRL DOCUMENT v3.21.1
Financial Instruments Measured at Fair Value and Concentrations of Credit Risk - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]    
Fair value of financing leases $ 15.1 $ 15.2
Commodity Contracts [Member]    
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]    
Commodity derivative assets, notional amount 10.4  
Unrealized commodity derivative losses from hedging contracts sold $ 3.0