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Impairment Charges - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value Measurements [Member]
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-lived assets held and used $ 10.0
Long-lived assets held and used, Total Impairment Charges 7.3
Level 1 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-lived assets held and used 0.0
Level 2 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-lived assets held and used 0.0
Level 3 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-lived assets held and used $ 10.0