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Financial Instruments - Summary of Consolidated Financial Ratios (Detail) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 384.00% | 385.00% | 422.00%
Coverage Ratio | 441.00% | 346.00% | 318.00%
Less than or Equal to 6.00 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio |  |  | 600.00%
Greater than or Equal to 1.85 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Coverage Ratio |  |  | 185.00%
Less than or Equal to 5.25 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio |  | 525.00% |
Greater than or Equal to 2.50 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Coverage Ratio | 250.00% | 250.00% |
Less than or Equal to 4.75 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 475.00% |  |

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