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Long-term debt - Additional Information (Detail) - USD ($)
3 Months Ended
Feb. 13, 2020
Mar. 31, 2020
Mar. 31, 2019
Debt Instrument [Line Items]      
Debt refinancing charges   $ 2,948,000 $ 0
Weighted average effective interest rate at quarter end   3.75%  
Weighted average effective interest rate during quarter   4.35%  
Percentage of debt instruments bearing fixed interest rate   41.83%  
Letters of credit outstanding   $ 57,705,000  
Revolving line of credit      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date   Aug. 12, 2024  
Maximum borrowing capacity on the revolving credit facilities   $ 1,000,000,000  
Term Loan B-1      
Debt Instrument [Line Items]      
Debt Instrument Agreement Date Feb. 13, 2020    
Debt Instrument, Maturity Date Aug. 12, 2026    
Additional Debt Principal Amount Due To New Agreement $ 0    
Debt refinancing charges   2,948,000  
Noncash Financing Outflows Related To Extinguishment Of Long Term Debt   55,895,000  
Debt Instrument, Periodic Payment, Principal   $ 6,858,000  
Term Loan B-1 | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
LIBOR plus interest rate margin 1.75%    
Term Loan B      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date   Aug. 12, 2026  
Cash outflows from extinguishment of secured debt   $ 68,842,000  
Cash inflows from reborrowing of secured debt   $ 68,842,000  
Term Loan A      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date   Aug. 12, 2024  
Debt Instrument, Periodic Payment, Principal   $ 10,938,000  
Term Loan A and Revolver subject to uncapped portion of variability of LIBOR      
Debt Instrument [Line Items]      
Line of credit outstanding principal balance   $ (1,464,392,000)  
Senior Secured Credit Facilities      
Debt Instrument [Line Items]      
Weighted average effective interest rate at quarter end   2.78%