| **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)                                                                               | 2,005,000                |     |   |
| 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                                                                                                       | $ 1,663                  | $ 1,772  |   |
| Unrecognized compensation cost related to unvested stock option                                                                       | $ 10,669                 |     |   |
| Weighted average period expected to be amortized, non vested shares                                                                   | 1 year 10 months 24 days |     |   |
| Weighted-average expected volatility used                                                                                             | 30.60%                   | 30.60%   |   |
| Weighted average grant date fair value of stock options granted (in dollars per share)                                                | $ 78.12                  | $ 79.03  |   |
| Total intrinsic value of options exercised                                                                                            | $ 8,350                  | $ 6,961  |   |
| Cash received from the exercise of stock options                                                                                      | $ 8,807                  | 5,721    |   |
| 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                 |     |   |
| Weighted average period expected to be amortized, non vested shares                                                                   | 6 months                 |     |   |
| 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                |     |   |
| Unrecognized compensation cost related to nonvested restricted stock                                                                  | $ 173                    |     |   |
| Expense related to nonvested common shares                                                                                            | 160                      | 314      |   |
| Common share dividends amount included in compensation cost                                                                           | $ 2                      | 5        |   |
| Weighted average grant date fair value (in dollars per share)                                                                         | $ 170.56                 |     | $ 167.99 |
| 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                                                                  | $ 14,661                 |     |   |
| Expense related to nonvested common shares                                                                                            | $ 2,258                  | 2,273    |   |
| Weighted average grant date fair value (in dollars per share)                                                                         | $ 233.00                 |     | $ 223,770 |
| Performance Share Incentive Awards                                                                                                    |                     |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                     |     |   |
| Award requisite service period                                                                                                        | 3 years                  |     |   |
| Compensation expense                                                                                                                  | $ 2,062                  | 3,944    |   |
| Cumulative amount recorded in shareholders' equity related to long-term incentive plan                                                | 10,603                   | $ 10,959 |   |
| Unrecognized compensation cost                                                                                                        | $ 12,980                 |     |   |
| 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)                                                                         | $ 231.34                 | $ 273.50 |   |
| 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)                                                                         |                     | 260.60   |   |
| Performance Share Incentive Awards | Grant Date Three                                                                                 |                     |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                     |     |   |
| Weighted average grant date fair value (in dollars per share)                                                                         |                     | $ 221.94 |   |
| Deferred Compensation                                                                                                                 |                     |     |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |                     |     |   |
| Common share dividends amount included in compensation cost                                                                           | $ 18                     | $ 18     |   |
| 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                                                                                     | $ 80                     | $ 76     |   |

| X                                                                                                                                                                                                                                                                                      |
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Cumulative amount recorded in shareholders' equity.
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Deferred compensation arrangement with individual employee contribution percentage maximum.
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Deferred compensation arrangement with individual employee contribution percentage of long term incentive compensation maximum.
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Normal retirement age of employees.
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Share based compensation share based award restricted shares termination period for disability or death.
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Share based compensation share based award options forfeiture period for retirees.
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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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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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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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| - Definition
Number of shares authorized for issuance under share-based payment arrangement.
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| - Definition
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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| - Definition
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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| - Definition
Percentage of vesting of award under share-based payment arrangement.
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| - Definition
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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| - Definition
Amount of noncash expense for option under share-based payment arrangement.
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| X                                                                                                                                    |
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