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Subsequent Events (Detail)
1 Months Ended
Nov. 02, 2021
Sep. 30, 2021
4.75% Senior Notes    
Subsequent events    
Stated interest rate   4.75%
4.25% Senior Notes    
Subsequent events    
Stated interest rate   4.25%
5.50% Senior Notes    
Subsequent events    
Stated interest rate   5.50%
Subsequent Event | Minimum    
Subsequent events    
Percentage of principal amount of consenting notes paid as consent fees to note holders 0.75%  
Subsequent Event | Maximum    
Subsequent events    
Percentage of principal amount of consenting notes paid as consent fees to note holders 1.00%