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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

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