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Long-Term Debt and Short-Term Borrowings - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total long-term debt $ 1,793,692 $ 1,773,396
Less: current maturities of long-term debt (1,526) (1,814)
Less: unamortized debt issuance costs (8,954) (10,337)
Total long-term debt, net of current maturities 1,783,212 1,761,245
Senior secured term loans [Member]    
Debt Instrument [Line Items]    
Total long-term debt 768,988 748,531
Other Long Term Debt [Member]    
Debt Instrument [Line Items]    
Total long-term debt 1,526 1,861
4.875% Senior Notes [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Total long-term debt 597,364 597,052
5.25% Senior Notes [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Total long-term debt $ 425,814 $ 425,952