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Shareholders' capital - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2019 USD ($) $ / shares shares | Mar. 31, 2019 $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares $ / shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 $ / shares | Feb. 28, 2019 USD ($)
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Options granted (CAD per share) | $ / shares |  |  |  |  |  | $ 14.96 |  |  |
Exercise period of options (in years) |  |  |  |  | 8 years |  |  |  |
Options exercised (USD per share) | $ / shares |  | $ 10.44 |  |  |  |  |  |  |
Options settled (in shares) |  | 2,022,382 |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 2,566,000 | $ 2,061,000 | $ 4,473,000 |  | $ 3,645,000 |  |
Unrecognized compensation costs, non-vested options | $ |  |  | 1,808,000 |  | 1,808,000 | $ 1,808,000 |  |  |
Unrecognized compensation costs, non-vested awards | $ |  |  | $ 9,993,000 |  | $ 9,993,000 | $ 9,993,000 |  |  |
Stock Option Plans |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 573,975 |  |  |  |  |  |  |
Unrecognized compensation costs, non-vested, period of recognition |  |  |  |  | 2 years 1 month 6 days |  |  |  |
Performance share units |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 179,830 |  |  |  |  |  |  |
Shares settled for stock (in shares) |  | 344,340 |  |  |  |  |  |  |
Shares settled for payments (in shares) |  | 164,510 |  |  |  |  |  |  |
Unrecognized compensation costs, non-vested, period of recognition |  |  |  |  | 1 year 9 months 19 days |  |  |  |
Bonus Deferral Restricted Stock Units |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  | 125,001 |  |  |  |  |  |
Deferred Share Units |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares issued during period (in shares) |  |  |  |  | 42,215 |  |  |  |
Executive |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 1,113,775 |  |  |  |
Options exercised (in shares) |  | 2,596,357 |  |  |  |  |  |  |
Executive | Performance share units |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) | 385,967 | 366,787 |  |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Dividend payable (in CAD per share) | $ / shares |  |  |  |  |  |  |  | $ 1.2728 |
Dividend rate, subsequent yield period |  |  |  |  | 5 years |  |  |  |
Preferred stock redemption price per share (in CAD per share) | $ / shares |  |  |  |  |  |  |  | $ 25 |
Subsequent redemption period |  |  |  |  | 5 years |  |  |  |
Government of Canada Bond Yield, Five Year | Series D Preferred Stock |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 3.28% |  |  |  |
ATM Equity Program |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Sale of Stock, Value of Shares Issued in Transaction | $ |  |  |  |  |  |  |  |  | $ 250,000
Value of common shares issued from treasury |  |  |  |  | 509,431 |  |  |  |
Price per share of sale of stock (in usd per share) | $ / shares |  |  | $ 12.23 |  | $ 12.23 | $ 12.23 |  |  |
Gross proceeds from sale of stock | $ |  |  |  |  | $ 6,233,000 |  |  |  |
Related commissions and fees on sale of stock | $ |  |  |  |  | 1,128,000 |  |  |  |
Net proceeds from sale of stock | $ |  |  |  |  | $ 6,139,000 |  |  |  |
Subsequent Event | ATM Equity Program |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Value of common shares issued from treasury | 564,500 |  |  |  |  |  |  |  |
Price per share of sale of stock (in usd per share) | $ / shares | $ 12.36 |  |  |  |  |  |  |  |
Gross proceeds from sale of stock | $ | $ 6,979,000 |  |  |  |  |  |  |  |
Net proceeds from sale of stock | $ | $ 6,874,000 |  |  |  |  |  |  |  |

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