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Long-Term Debt and Short-Term Borrowings - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total long-term debt $ 1,778,397 $ 2,022,598
Less: current maturities of long-term debt (1,466) (8)
Less: unamortized debt issuance costs (14,046) (22,987)
Total long-term debt, net of current maturities 1,762,885 1,999,603
Other Long Term Debt [Member]    
Debt Instrument [Line Items]    
Total long-term debt 5,711 8
2.51% to 3.07% Senior Term Loans [Member]    
Debt Instrument [Line Items]    
Total long-term debt 750,000 200,000
4.875% Senior Notes [Member]    
Debt Instrument [Line Items]    
Total long-term debt 596,460 596,273
5.25% Senior Notes [Member]    
Debt Instrument [Line Items]    
Total long-term debt $ 426,226 426,317
5.00% Senior Notes [Member]    
Debt Instrument [Line Items]    
Total long-term debt   $ 800,000