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Shareholders' Equity and Share Based Compensation - Summary of Performance base restricted share unit activity (Detail) - Performance-Based Restricted Share Unit [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |  |
Number of Performance-based Restricted Share Units, Beginning balance | 869,000 | 739,000 | 1,056,666
Number of Performance-based Restricted Share Units, Granted | 158,000 | 1,068,000 | 355,000
Number of Performance-based Restricted Share Units, Received |  |  | (442,666)
Number of Performance-based Restricted Share Units, Forfeited |  | (98,000) |
Number of Performance-based Restricted Share Units, Exercised | (487,000) |  |
Number of Performance-based Restricted Share Units, Forfeited/expired | (310,000) |  | (230,000)
Number of Performance-based Restricted Share Units, Ending balance | 230,000 | 869,000 | 739,000
Number of Performance-based Restricted Share Units, Exercisable | 200,000 | 75,000 | 30,000
Weighted Average Grant Date Fair Value, Beginning balance | $ 7.51 | $ 7.92 | $ 5.56
Weighted Average Grant Date Fair Value, Granted | 9.68 | 6.36 | 14.94
Weighted Average Grant Date Fair Value, Received |  |  | 7.82
Weighted Average Grant Date Fair Value, Forfeited |  | 9.59 |
Weighted Average Grant Date Fair Value, Exercised | 7.14 |  |
Weighted Average Grant Date Fair Value, Forfeited/expired | 8.35 |  | 12.90
Weighted Average Grant Date Fair Value, Ending balance | 8.67 | 7.51 | 7.92
Weighted Average Grant Date Fair Value, Exercisable | $ 8.24 | $ 6.10 | $ 12.87
Exercise price in CA$6.47 |  |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |  |
Number of Performance-based Restricted Share Units, Granted |  | (840,000) |
Weighted Average Grant Date Fair Value, Granted |  | $ 6.47 |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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