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Financial Instruments - Summary of Coverage Ratio and Leverage Ratio (Detail) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 4.07% | 4.17% | 3.84%
Less than or Equal to 6.25 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 6.25% |  |
Less than or Equal to 6.00 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 6.00% |  |
Less than or Equal to 5.75 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 5.75% |  |
Less than or Equal to 5.25 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 5.25% |  |
Less than or Equal to 4.75 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 4.75% |  | 4.75%
Less than or Equal to 4.50 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 4.50% |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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