Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Long-term Debt Instruments (Detail)

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Debt - Schedule of Long-term Debt Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Debt Instrument [Line Items]      
Finance lease obligation $ 85 $ 96  
Units subject to mandatory redemption 4,372 4,267  
Debt 1,979,271 1,590,096  
Less current portion (22,640) (23,469)  
Long term debt 1,956,631 1,566,627 $ 1,956,631
Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Debt 1,577,078 1,578,972  
Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Debt 394,569 0  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt 388 387  
Commercial Paper [Member] | Commercial notes interest rate 1.66% due June 01 ,2022 [Member]      
Debt Instrument [Line Items]      
Debt 415 1,656  
Commercial Paper [Member] | Commercial notes interest rate 1.66% due July 15, 2022 [Member]      
Debt Instrument [Line Items]      
Debt 1,991 745  
Commercial Paper [Member] | Commercial notes interest rate 1.66% due July 21, 2022 [Member]      
Debt Instrument [Line Items]      
Debt $ 373 $ 3,973