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Summary of Status of Equity Incentive Plan (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 shares $ / shares | Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares
Canadian Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 148,665 | 148,665 | 201,079 | 201,079 |
Options Outstanding, Forfeited | shares | (33,060) | (33,060) | (52,414) | (52,414) |
Options Outstanding, Ending balance | shares | 115,605 | 115,605 | 148,665 | 148,665 |
Weighted Average Exercise Price, Beginning balance | $ 138.86 |  | $ 145.88 |  |
Weighted Average Exercise Price, Forfeitures | 193.10 |  | 165.79 |  |
Weighted Average Exercise Price, Ending balance | $ 123.35 |  | $ 138.86 |  |
Options exercisable | shares | 115,605 | 115,605 | 141,156 | 141,156 | 178,453
Canadian Share Options [Member] | Top of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance | $ 286.20 |  | $ 286.20 |  |
Range of Exercise Prices, Forfeitures | 286.20 |  | 203.00 |  |
Range of Exercise Prices, Ending balance | 146.40 |  | 286.20 |  |
Canadian Share Options [Member] | Bottom Of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance | 87.00 |  | 87.00 |  |
Range of Exercise Prices, Forfeitures | 89.20 |  | 87.00 |  |
Range of Exercise Prices, Ending balance | $ 87.00 |  | $ 87.00 |  |
U.S. Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 283,793 | 283,793 | 318,153 | 318,153 |
Options Outstanding, Granted | shares | 0 | 0 | 0 | 0 |
Options Outstanding, Forfeited | shares | (15,950) | (15,950) | (34,360) | (34,360) |
Options Outstanding, Ending balance | shares | 267,843 | 267,843 | 283,793 | 283,793 |
Weighted Average Exercise Price, Beginning balance |  | $ 86.23 |  | $ 93.32 |
Weighted Average Exercise Price, Forfeitures |  | 183.60 |  | 151.92 |
Weighted Average Exercise Price, Ending balance |  | $ 80.43 |  | $ 86.23 |
Options exercisable | shares | 257,854 | 257,854 | 239,521 | 239,521 | 217,441
U.S. Share Options [Member] | Top of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance |  | $ 183.60 |  | $ 183.60 |
Range of Exercise Prices, Forfeitures |  | 183.60 |  | 183.60 |
Range of Exercise Prices, Ending balance |  | 115.80 |  | 183.60 |
U.S. Share Options [Member] | Bottom Of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance |  | 51.20 |  | 51.20 |
Range of Exercise Prices, Forfeitures |  | 183.60 |  | 64.20 |
Range of Exercise Prices, Ending balance |  | $ 51.20 |  | $ 51.20 |

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