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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Shareholders' capital - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands							12 Months Ended
	Dec. 20, 2018 CAD ($) shares	Dec. 20, 2018 USD ($) $ / shares shares	Apr. 24, 2018 CAD ($) shares	Apr. 24, 2018 USD ($) $ / shares shares	Nov. 10, 2017 CAD ($) shares	Nov. 10, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) Right vote shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2023 $ / shares	Dec. 31, 2018 CAD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 20, 2018 $ / shares	Apr. 24, 2018 $ / shares	Nov. 10, 2017 $ / shares
Stockholders Equity Note [Line Items]
Number of entitled votes per common share \| vote							1
Number of voting rights per share \| Right							1
Discount rate on share purchases							50.00%
Common shares issued (in shares)							50,041,624	43,470,000
Discount rate on share purchases under dividend reinvestment plan							5.00%
Dividend reinvestment plan shares issued (in shares)							1,606,001
Carrying amount C$								$ 184,299			$ 184,299
Preferred stock redemption price per share (in CAD per share) \| $ / shares										$ 25
Total share-based compensation expense \| $							$ 9,458	8,361
Death Benefits
Stockholders Equity Note [Line Items]
Stock options exercised period							1 year
Resignation or Termination
Stockholders Equity Note [Line Items]
Stock options exercised period							30 days
Maximum \| Retirement
Stockholders Equity Note [Line Items]
Stock options exercised period							90 days
Minimum
Stockholders Equity Note [Line Items]
Percentage of outstanding stock to be purchased to acquire discount (or more)							20.00%
Employee Stock Option
Stockholders Equity Note [Line Items]
Total share-based compensation expense \| $							$ 2,054	3,070
Unrecognized compensation costs, non-vested options \| $											$ 1,221
Unrecognized compensation costs, non-vested options, period of recognition							1 year 7 months 21 days
Stock Option Plans \| Maximum
Stockholders Equity Note [Line Items]
Percentage of shares reserves under plan (must not exceed)							8.00%
Performance Share Units
Stockholders Equity Note [Line Items]
Maximum aggregate number of shares reserved for future issuance (in shares)										7,000,000	7,000,000
Performance share units granting period							3 years
Percentage of shares issued on number of PSU grants, minimum							2.00%
Percentage of shares issued on number of PSU grants, maximum							237.00%
Employee share purchase
Stockholders Equity Note [Line Items]
Total share-based compensation expense \| $							$ 312	$ 436
Vesting period of matching contribution shares							1 year
Maximum aggregate number of shares reserved for future issuance (in shares)										2,000,000	2,000,000
Common stock, shares issued (in shares)								283,523		252,698	252,698
Deferred Share Units
Stockholders Equity Note [Line Items]
Maximum aggregate number of shares reserved for future issuance (in shares)										1,000,000	1,000,000
Shares issued during period (in shares)							380,656	293,906.32
Performance and restricted share units
Stockholders Equity Note [Line Items]
Total share-based compensation expense \| $							$ 6,378	$ 4,262
Unrecognized compensation costs, non-vested awards \| $											$ 8,243
Unrecognized compensation costs, non-vested options, period of recognition							1 year 7 months 5 days
Series A Preferred Stock
Stockholders Equity Note [Line Items]
Preferred stock issued (in shares)								4,800,000		4,800,000	4,800,000
Shares issued, price per share (CAD per share) \| (per share)								$ 25		$ 25
Carrying amount C$								$ 100,463		$ 116,546	$ 100,463
Fixed cumulative annual dividend per share (CAD per share) \| $ / shares										$ 1.125
Subsequent yield period							5 years
Preferred stock, Subsequent redemption period							5 years
Series C Preferred Stock
Stockholders Equity Note [Line Items]
Preferred stock redemption price per share (in CAD per share) \| $ / shares										$ 53,400
Redeemable preferred stock issued (in shares)										100	100
Series D Preferred Stock
Stockholders Equity Note [Line Items]
Preferred stock issued (in shares)								4,000,000		4,000,000	4,000,000
Shares issued, price per share (CAD per share) \| (per share)								$ 25		$ 25
Carrying amount C$								$ 83,836		$ 97,259	$ 83,836
Fixed cumulative annual dividend per share (CAD per share) \| $ / shares										$ 1.25
Subsequent yield period							5 years
Preferred stock, Subsequent redemption period							5 years
Government of Canada Bond Yield \| Series A Preferred Stock
Stockholders Equity Note [Line Items]
Dividend variable interest rate							2.94%
Government of Canada Bond Yield \| Series D Preferred Stock
Stockholders Equity Note [Line Items]
Dividend variable interest rate							3.28%
Government of Canada Treasury Bill Yield \| Series B Preferred Stock
Stockholders Equity Note [Line Items]
Dividend variable interest rate							2.94%
Government of Canada Treasury Bill Yield \| Series E Preferred Stock
Stockholders Equity Note [Line Items]
Dividend variable interest rate							3.28%
Range One \| Employee share purchase
Stockholders Equity Note [Line Items]
Employer matching contribution, percent							20.00%
Range Two \| Employee share purchase
Stockholders Equity Note [Line Items]
Employer matching contribution, percent							10.00%
Range Three \| Employee share purchase
Stockholders Equity Note [Line Items]
Employer matching contribution, percent							15.00%
Public Stock Offering
Stockholders Equity Note [Line Items]
Sale of stock, price per share (CAD per share) \| (per share)		$ 10.09		$ 9.23		$ 10.45						$ 13.76	$ 11.85	$ 13.25
Payments of Stock Issuance Costs	$ 492	$ 366	$ 765	$ 590	$ 24,342	$ 19,193
Public Stock Offering \| Common shares
Stockholders Equity Note [Line Items]
Number of shares issued pursuant to public offering	12,536,350	12,536,350	37,505,274	37,505,274	43,470,000	43,470,000
Cash proceeds from issuance of shares	$ 172,500	$ 126,485	$ 444,437	$ 346,458	$ 576,000	$ 454,158
Payments Of Stock Issuance Costs, Net of Tax					$ 17,895	$ 14,109
Scenario, Forecast \| Series A Preferred Stock
Stockholders Equity Note [Line Items]
Fixed cumulative annual dividend per share (CAD per share) \| $ / shares									$ 1.2905