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v3.20.4

Organization and Significant Accounting Policies - Property Plant And Equipment Useful Lives (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Period over which internal use developed software costs are amortised | 5 years | 5 years | 5 years

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