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Long-term debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2019
Jun. 20, 2019
Jun. 19, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                  
Debt prepayment charges       $ 12,160 $ 0 $ 12,160 $ 0    
Weighted average effective interest rate at quarter end       5.30%   5.30%      
Weighted average effective interest rate during quarter       5.17%   5.16%      
Percentage of debt instruments bearing fixed interest rate       54.10%   54.10%      
Letters of credit outstanding       $ 72,763   $ 72,763      
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Proceeds from Long-term Lines of Credit       550,000          
Maximum borrowing capacity on the revolving credit facilities       $ 1,000,000   $ 1,000,000      
Senior Secured Credit Facilities                  
Debt Instrument [Line Items]                  
Weighted average effective interest rate at quarter end       5.31%   5.31%      
Term Loan A and A-2                  
Debt Instrument [Line Items]                  
Debt prepayment charges       $ 1,492   $ 1,492      
Term Loan A                  
Debt Instrument [Line Items]                  
Early repayment of Senior debt   $ 583,041              
Mandatory principal payments       27,576   27,576      
Secured Debt       (64,383)   (64,383)     $ (675,000)
Term Loan A-2                  
Debt Instrument [Line Items]                  
Early repayment of Senior debt   $ 892,502              
Secured Debt       (102,498)   (102,498)     (995,000)
Term Loan B                  
Debt Instrument [Line Items]                  
Mandatory principal payments       17,500   17,500      
Secured Debt       (3,325,000)   (3,325,000)     $ (3,342,500)
Debt prepayment charges       10,668   10,668      
Term Loan A subject to uncapped portion of variability of LIBOR                  
Debt Instrument [Line Items]                  
Line of credit outstanding principal balance       $ (541,881)   (541,881)      
Maximum                  
Debt Instrument [Line Items]                  
Unrestricted proceeds from divestiture of business           $ 750,000      
Forecast | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Secured Debt               $ (1,000,000)  
Forecast | Term Loan A                  
Debt Instrument [Line Items]                  
Secured Debt               (1,750,000)  
Forecast | Term Loan B                  
Debt Instrument [Line Items]                  
Secured Debt               (2,500,000)  
Subsequent Event                  
Debt Instrument [Line Items]                  
Early repayment of Senior debt $ 2,990,328                
Subsequent Event | Term Loan A                  
Debt Instrument [Line Items]                  
Early repayment of Senior debt 64,383                
Subsequent Event | Term Loan A-2                  
Debt Instrument [Line Items]                  
Early repayment of Senior debt 102,498                
Subsequent Event | Term Loan B                  
Debt Instrument [Line Items]                  
Early repayment of Senior debt $ 2,823,447                
Secured Debt               $ (501,553)  
Discontinued Operations, Held-for-sale | DMG held for sale                  
Debt Instrument [Line Items]                  
Business acquisition, Effective date of acquisition     Jun. 19, 2019