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Long-term debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Weighted average effective interest rate at quarter end 4.10% 4.10%  
Weighted average effective interest rate during quarter 3.68% 3.41%  
Percentage of debt instruments bearing fixed interest rate 50.00% 50.00%  
Revolving line of credit      
Debt Instrument [Line Items]      
Secured Debt $ 425,000 $ 425,000 $ 0
Line of Credit Facility, Remaining Borrowing Capacity 575,000 575,000  
Maximum borrowing capacity on the revolving credit facilities 1,000,000 1,000,000  
Letter of Credit      
Debt Instrument [Line Items]      
Letters of credit outstanding 0 0  
Bilateral Secured Letter Of Credit Facility      
Debt Instrument [Line Items]      
Letters of credit outstanding 108,070 108,070  
Term Loan A      
Debt Instrument [Line Items]      
Debt Instrument, Periodic Payment, Principal   43,750  
Secured Debt Outstanding Principal Balance Subject To LIBOR 727,672 727,672  
Secured Debt 1,553,125 1,553,125 1,596,875
Term Loan B-1      
Debt Instrument [Line Items]      
Debt Instrument, Periodic Payment, Principal   13,716  
Secured Debt $ 2,674,547 $ 2,674,547 $ 2,688,263
Senior Secured Credit Facilities      
Debt Instrument [Line Items]      
Weighted average effective interest rate at quarter end 3.77% 3.77%