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Long-Term Debt and Short-Term Borrowings - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 18, 2021 | Dec. 31, 2020 | Aug. 13, 2015
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 1,853,490 |  | $ 1,387,743 |
Less: current maturities of long-term debt | 0 |  | 1,514 |
Less: unamortized debt issuance costs | 9,641 |  | 6,027 |
Long-term debt, net of current maturities | 1,843,849 |  | 1,380,202 |
Senior secured term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 763,070 |  | 788,759 |
Senior secured term loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 0.75% |  |  |
Senior secured term loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 1.15% |  |  |
Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 0 |  | 1,514 |
4.875% Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 4.875% |  |  | 4.875%
Total long-term debt | $ 597,799 |  | $ 597,470 |
2.5% Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.50% | 2.50% | 2.50% |
Total long-term debt | $ 492,621 |  | $ 0 |

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