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v3.19.1

Financial Instruments - Summary of Coverage Ratio and Leverage Ratio (Detail) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [line items] |  |  |
Coverage Ratio | 441.00% | 346.00% | 318.00%
Leverage Ratio | 384.00% | 385.00% | 422.00%
Less than or Equal to 4.75 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 475.00% |  |
Less than or Equal to 4.50 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 450.00% |  |
Less than or Equal to 4.25 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 425.00% |  |
Greater than or Equal to 2.50 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Coverage Ratio | 250.00% | 250.00% |
Greater than or Equal to 2.75 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Coverage Ratio | 275.00% |  |

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- Definition Coverage ratio. + References No definition available. + Details
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- Definition Leverage ratio. + 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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