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
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Finance lease obligation $ 149 $ 225
Unsecured promissory notes 1,112 363
Units subject to mandatory redemption 4,060 3,866
Debt 1,592,774 1,585,350
Less current portion (22,547) (19,158)
Long term debt 1,570,227 1,566,192
Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Debt 1,582,761 1,578,930
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt 162 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 $ 4,530