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Shareholders' capital - Additional Information (Detail) |  |  | 3 Months Ended | 6 Months Ended | 30 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 05, 2021 shares | Apr. 15, 2021 shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Aug. 12, 2021 USD ($) $ / shares shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 3,189,000 | $ 9,997,000 | $ 4,386,000 |  | $ 11,640,000 |
Unrecognized compensation costs, non-vested awards | $ |  |  | $ 19,712,000 |  | $ 19,712,000 | $ 19,712,000 |  |
Unrecognized compensation costs, non-vested options, period of recognition |  |  |  |  | 1 year 11 months 12 days |  |  |
Weighted average grant date fair value per option (CAD per share) | $ / shares |  |  |  |  |  | $ 2.46 |  |
Options exercised (in shares) |  |  |  |  | (61,225) |  |  |
Exercised (CAD per share) | $ / shares |  |  |  |  |  | $ 14.75 |  |
Treasury Stock, Common |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Shares issued from treasury to settles RSUs and PSUs (in shares) |  |  |  |  | 12,021 |  |  |
Common shares |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares) |  |  |  |  | 49,204 |  |  |
RSUs and PSUs |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Equity other than options granted in period (in shares) |  |  |  |  | 703,620 |  |  |
PSU's and RSU's exercised (in shares) |  |  |  |  | (709,853) |  |  |
RSUs and PSUs | Treasury Stock, Common |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Shares issued from treasury to settles RSUs and PSUs (in shares) |  |  |  |  | 373,314 |  |  |
RSUs and PSUs | Common shares |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares) |  |  |  |  | 336,539 |  |  |
RSUs | Subsequent Event |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | 105,876 |  |  |  |  |  |  |
RSUs | Treasury Stock, Common | Subsequent Event |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Shares issued from treasury to settles RSUs and PSUs (in shares) | 49,200 |  |  |  |  |  |  |
RSUs | Common shares | Subsequent Event |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares) | 56,676 |  |  |  |  |  |  |
Bonus Deferral Restricted Stock Units |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Awards vested (percent) |  | 100.00% |  |  |  |  |  |
Equity other than options granted in period (in shares) |  | 44,528 |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  | 148,459 |  | 148,459 | 148,459 |  |
Bonus Deferral Restricted Stock Units | Treasury Stock, Common |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Shares issued from treasury to settles RSUs and PSUs (in shares) |  |  |  |  | 68,841 |  |  |
Bonus Deferral Restricted Stock Units | Common shares |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares) |  |  | 79,618 |  |  |  |  |
Deferred Share Units |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Equity other than options granted in period (in shares) |  |  |  |  | 35,549 |  |  |
Common stock, shares issued (in shares) |  |  | 85,210 |  | 85,210 | 85,210 |  |
Deferred Share Units | Treasury Stock, Common |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Shares issued from treasury to settles RSUs and PSUs (in shares) |  |  | 39,719 |  |  |  |  |
Deferred Share Units | Common shares |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares) |  |  | 45,491 |  |  |  |  |
Executive |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 437,006 |  |  |
Weighted average grant date fair value per option (CAD per share) | $ / shares |  |  |  |  |  | $ 19.64 |  |
Options expiration period |  |  |  |  | 8 years |  |  |
Executive | Options vesting December 31, 2022 |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Awards vested (percent) |  |  |  |  | 33.33% |  |  |
Executive | Options vesting December 31, 2023 |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Awards vested (percent) |  |  |  |  | 33.33% |  |  |
Executive | Options vesting December 31, 2024 |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Awards vested (percent) |  |  |  |  | 33.33% |  |  |
ATM Equity Program |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Treasury atock, amount reserved for issuance under the plan | $ |  |  | $ 500,000,000 |  | $ 500,000,000 | $ 500,000,000 |  |
Number of shares issued pursuant to public offering (in shares) |  |  |  |  | 16,789,922 |  |  |
Sale of stock, average price per share (in USD) | $ / shares |  |  |  |  | $ 15.73 |  |  |
Cash proceeds from issuance of shares | $ |  |  |  |  | $ 264,112,000 |  |  |
Gross proceeds from sale of stock, net of commissions | $ |  |  |  |  | 260,810,000 |  |  |
Sale of stock, other related costs | $ |  |  |  |  | $ 620,000 |  |  |
ATM Equity Program | Subsequent Event |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Number of shares issued pursuant to public offering (in shares) |  |  |  |  |  |  |  | 27,211,284
Sale of stock, average price per share (in USD) | $ / shares |  |  |  |  |  |  |  | $ 14.95
Cash proceeds from issuance of shares | $ |  |  |  |  |  |  |  | $ 406,780,000
Gross proceeds from sale of stock, net of commissions | $ |  |  |  |  |  |  |  | 401,695,000
Sale of stock, other related costs | $ |  |  |  |  |  |  |  | $ 4,033,000

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