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
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Finance lease obligation $ 117 $ 225
Unsecured promissory notes 363
Units subject to mandatory redemption 4,163 3,866
Debt 1,595,179 1,585,350
Less current portion (26,769) (19,158)
Long term debt 1,568,410 1,566,192
Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Debt 1,580,851 1,578,930
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt 333 15
Commercial Paper [Member] | Commercial notes interest rate 2.50% due June 01 ,2021 [Member]    
Debt Instrument [Line Items]    
Debt 1,951
Commercial Paper [Member] | Commercial notes interest rate 1.66% due June 01 ,2022 [Member]    
Debt Instrument [Line Items]    
Debt 2,891
Commercial Paper [Member] | Commercial notes interest rate 1.66% due July 15, 2022 [Member]    
Debt Instrument [Line Items]    
Debt 877
Commercial Paper [Member] | Commercial notes interest rate 1.66% due July 21, 2022 [Member]    
Debt Instrument [Line Items]    
Debt $ 5,947