| **Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands**                          | 3 Months Ended            |          |
|---------------------------------------------------------------------------------------------------------------------------------------|---------------------------|----------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Maximum number of common shares authorized for grant (in shares)                                                                      | 900,000                   |     |   |
| Number of common shares available for grant (in shares)                                                                               | 1,718,000                 |     |   |
| Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum | 100.00%                   |     |   |
| Executive officers share-based long-term incentive compensation deferrals percentage, maximum                                         | 90.00%                    |     |   |
| Stock Options                                                                                                                         |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Option expiring period                                                                                                                | 10 years                  |     |   |
| Normal retirement age                                                                                                                 | 65 years                  |     |   |
| Period for options considered to be forfeited for retirees                                                                            | 12 months                 |     |   |
| Termination period on death or disability of option holder                                                                            | 12 months                 |     |   |
| Compensation expense recognized                                                                                                       | $ 748                     | $ 1,088  |   |
| Unrecognized compensation cost related to unvested stock option                                                                       | $ 8,264                   |     |   |
| Weighted average period expected to be amortized, non vested shares                                                                   | 2 years 10 months 24 days |     |   |
| Weighted-average expected volatility used                                                                                             | 30.50%                    | 30.70%   |   |
| Weighted average grant date fair value of stock options granted (in dollars per share)                                                | $ 68.11                   | $ 79.81  |   |
| Total intrinsic value of options exercised                                                                                            | $ 1,351                   | $ 14,127 |   |
| Cash received from the exercise of stock options                                                                                      | $ 1,001                   | 14,418   |   |
| Stock Options | Maximum                                                                                                               |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Maximum rate of stock option                                                                                                          | 25.00%                    |     |   |
| Restricted Shares and Restricted Share Units | Maximum                                                                                |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Grant restricted shares transferred period                                                                                            | 3 years                   |     |   |
| Restricted Shares and Restricted Share Units | Minimum                                                                                |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Grant restricted shares transferred period                                                                                            | 1 year                    |     |   |
| Restricted Stock                                                                                                                      |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Normal retirement age                                                                                                                 | 65 years                  |     |   |
| Period for restricted shares and share units considered to be forfeited for retirees                                                  | 12 months                 |     |   |
| Restricted shares termination period for disability or death                                                                          | 12 months                 |     |   |
| Restricted Stock Unit                                                                                                                 |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Weighted average period expected to be amortized, non vested shares                                                                   | 2 years 1 month 6 days    |     |   |
| Unrecognized compensation cost related to nonvested restricted stock                                                                  | $ 17,268                  |     |   |
| Expense related to nonvested common shares                                                                                            | $ 2,510                   | 2,226    |   |
| Weighted average grant date fair value (in dollars per share)                                                                         | $ 236.32                  |     | $ 238,830 |
| Performance Share Incentive Awards                                                                                                    |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Award requisite service period                                                                                                        | 3 years                   |     |   |
| Compensation expense                                                                                                                  | $ 1,249                   | $ 1,268  |   |
| Unrecognized compensation cost                                                                                                        | $ 11,984                  |     |   |
| Performance Share Incentive Awards | Grant Date One                                                                                   |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Weighted average grant date fair value (in dollars per share)                                                                         | $ 199.30                  |     |   |
| Performance Share Incentive Awards | Grant Date Two                                                                                   |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Weighted average grant date fair value (in dollars per share)                                                                         |                      | $ 229.58 |   |
| Deferred Compensation                                                                                                                 |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Common share dividends amount included in compensation cost                                                                           | $ 26                      | $ 21     |   |
| Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum | 100.00%                   |     |   |
| Executive officers share-based long-term incentive compensation deferrals percentage, maximum                                         | 90.00%                    |     |   |
| Deferred Compensation | Directors                                                                                                     |                      |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                      |     |   |
| Expense related to director deferred compensation                                                                                     | $ 100                     | $ 56     |   |

| X                                                                                                                                                                                                                                                                                                                                                                     |
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Normal retirement age of employees.
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| - Definition
Share based compensation share based award restricted shares termination period for disability or death.
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| - Definition
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| - Definition
Share based compensation arrangement by share based payment award termination period on death or disability of option holder.
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Share based compensation share based award restricted shares forfeiture period for retirees.
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| - Definition
Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The compensation expense recognized during the period pertaining to the deferred compensation arrangement.
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| - Definition
Amount of paid and unpaid cash, stock, and paid-in-kind dividends declared for award under share-based payment arrangement.
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| - Definition
Amount of cost not yet recognized for nonvested award under share-based payment arrangement.
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| - Definition
Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
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| - Definition
Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.
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| - Definition
Amount of cost to be recognized for option under share-based payment arrangement.
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| - Definition
Amount of cash inflow from exercise of option under share-based payment arrangement.
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| - Definition
Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.
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| - Definition
Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.
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| - Definition
Rate of weighted-average expected volatility for award under share-based payment arrangement.
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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.
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Number of shares authorized for issuance under share-based payment arrangement.
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.
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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.
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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.
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Percentage of vesting of award under share-based payment arrangement.
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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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Amount of noncash expense for option under share-based payment arrangement.
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