| **Share-Based Payments - Schedule of Valuation Assumptions (Detail)**              | 12 Months Ended         |
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| Total Shareholder Return Units (TSRUs) [Member]                                    |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                    |   |   |
| Expected dividend yield                                                            | 3.80%                   | 3.42% | 4.51% |
| Risk-free interest rate                                                            | 4.08%                   | 1.87% | 0.93% |
| Expected stock price volatility                                                    | 23.23%                  | 29.20% | 26.53% |
| Contractual term/expected term                                                     | 5 years 1 month 24 days | 5 years 2 months 1 day | 5 years 1 month 24 days |
| Stock Options [Member]                                                             |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]** |                    |   |   |
| Expected dividend yield                                                            | 3.80%                   | 3.42% | 4.51% |
| Risk-free interest rate                                                            | 4.03%                   | 1.93% | 1.27% |
| Expected stock price volatility                                                    | 23.23%                  | 29.21% | 26.54% |
| Contractual term/expected term                                                     | 6 years 6 months        | 6 years 6 months | 6 years 9 months |

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| - Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.
+ References
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| - Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.
+ References
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| - Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| - Definition
Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
+ References
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