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Debt - Long-term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Oct. 31, 2016 | Aug. 31, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2011
--- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Less: Debt issuance costs | $ (6,007) |  | $ (7,350) |  |  |  |  |
Total debt, net | 2,413,725 |  | 2,768,741 |  |  |  |  |
Less: Current portion, net | (132,284) |  | (497,449) |  |  |  |  |
Total long-term debt, net | 2,281,441 |  | $ 2,271,292 |  |  |  |  |
Interest rate on senior notes |  |  | 6.30% | 1.53% |  |  |  |
U.S. dollar 3.73% senior notes due September 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | 300,000 |  | $ 300,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  | 3.73% |
U.S. dollar 3.91% senior notes due June 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | 50,000 |  | 50,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 3.91% |  |
U.S. dollar 3.96% senior notes due August 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | 100,000 |  | 100,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  | 3.96% |  |  |
U.S. dollar 4.18% senior notes due December 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 275,000 |  | 275,000 |  |  |  |  |
Interest rate on senior notes | 4.18% |  |  |  |  |  |  |
U.S. dollar 3.83% senior notes due September 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 100,000 |  | 100,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  | 3.83% |
U.S. dollar 4.32% senior notes due December 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 250,000 |  | 250,000 |  |  |  |  |
Interest rate on senior notes | 4.32% |  |  |  |  |  |  |
U.S. dollar 4.37% senior notes due December 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 50,000 |  | 50,000 |  |  |  |  |
Interest rate on senior notes | 4.37% |  |  |  |  |  |  |
U.S. dollar 3.98% senior notes due September 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 100,000 |  | 100,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  | 3.98% |
U.S. dollar 4.45% senior notes due August 2035 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | 50,000 |  | 50,000 |  |  |  |  |
Interest rate on senior notes |  |  |  |  | 4.45% |  |  |
British pound 4.68% senior note due September 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | 0 |  | 106,140 |  |  |  |  |
Interest rate on senior notes |  | 4.68% |  |  |  |  |  |
British pound 2.59% senior note due November 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 204,880 |  | 199,011 |  |  |  |  |
Interest rate on senior notes | 2.59% |  |  |  |  |  |  |
British pound 2.70% senior note due November 2031 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 102,433 |  | 99,508 |  |  |  |  |
Interest rate on senior notes | 2.70% |  |  |  |  |  |  |
Euro 1.34% senior notes due October 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 366,806 |  | 336,797 |  |  |  |  |
Interest rate on senior notes | 1.34% |  |  |  |  |  |  |
Euro 1.71% senior notes due December 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 91,706 |  | 84,202 |  |  |  |  |
Interest rate on senior notes | 1.71% |  |  |  |  |  |  |
Euro 1.53% senior notes due October 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 244,572 |  | 224,553 |  |  |  |  |
Interest rate on senior notes | 1.53% |  |  |  |  |  |  |
Swiss franc 2.44% senior note due December 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 62,190 |  | 56,830 |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  | 2.44%
Revolving credit facility borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | 72,145 |  | 384,816 |  |  |  |  |
Other, principally foreign |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt, gross | $ 0 |  | $ 9,234 |  |  |  |  |

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