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Long-term debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jul. 15, 2020
Jun. 09, 2020
Feb. 13, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]              
Debt refinancing charges         $ 884,000 $ 0  
Weighted average effective interest rate at quarter end       3.65% 3.65%    
Weighted average effective interest rate during quarter       3.64% 3.98%    
Percentage of debt instruments bearing fixed interest rate       54.00% 54.00%    
Letters of credit outstanding       $ 57,452,000 $ 57,452,000    
Senior Notes Four Point Six Two Five Percent Due Twenty Thirty              
Debt Instrument [Line Items]              
Debt Instrument, Maturity Date         Jun. 01, 2030    
Senior Notes   $ 1,750,000,000   1,750,000,000 $ 1,750,000,000   $ 0
Debt Instrument, Date of First Required Payment   Dec. 01, 2020          
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   40.00%          
Debt Instrument, Redemption Price, Percentage   104.625%          
Debt Instrument related fees, discounts, and other professional expenses   $ 20,293,000          
Weighted average effective interest rate during quarter   4.625%     4.625%    
Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four              
Debt Instrument [Line Items]              
Debt Instrument, Maturity Date         Jul. 15, 2024    
Senior Notes             $ 1,750,000,000
Weighted average effective interest rate during quarter         5.125%    
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 $ 1,000,000,000    
Letter of Credit              
Debt Instrument [Line Items]              
Letters of credit outstanding       0 $ 0    
Term Loan B-1              
Debt Instrument [Line Items]              
Debt Instrument Agreement Date     Feb. 13, 2020        
Debt Instrument, Maturity Date     Aug. 12, 2026   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         $ 13,716,000    
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         $ 21,875,000    
Long-term Line of Credit       $ 946,597,000 $ 946,597,000    
Senior Secured Credit Facilities              
Debt Instrument [Line Items]              
Weighted average effective interest rate at quarter end       2.10% 2.10%    
2015 Interest Rate Cap Agreements Effective June 29, 2018              
Debt Instrument [Line Items]              
Derivative, Maturity Date         Jun. 30, 2020    
Derivative, effective date         Jun. 29, 2018    
2019 Interest Rate Cap Agreements Effective June 30, 2020              
Debt Instrument [Line Items]              
Derivative, Maturity Date         Jun. 30, 2024    
Derivative, effective date         Jun. 30, 2020    
Subsequent Event | Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four              
Debt Instrument [Line Items]              
Debt Instrument Redeemed Outstanding Principal Amount $ 1,750,000,000            
Debt Refinancing Call Premium Redemption Charge Incurred Upon Redemption Of Senior Notes 29,890,000            
Write off of Deferred Debt Issuance Cost $ 9,764,000