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Share Based Payments - Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) shares	Mar. 31, 2018 CAD ($) $ / shares shares	Mar. 31, 2017 USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Beginning balance outstanding | shares	2,448,646	2,448,646
Number of Options, Exercised | shares	(80,000)	(80,000)
Number of Options, Ending balance outstanding | shares	2,368,646	2,368,646
Number of Options, Exercisable | shares		1,371,739
Weighted Average Exercise Price, Beginning balance outstanding | $ / shares		$ 7.35
Weighted Average Exercise Price, Exercised | $ / shares		3.00
Weighted Average Exercise Price, Ending balance outstanding | $ / shares		7.50
Weighted Average Exercise Price, Exercisable | $ / shares		$ 5.85
Aggregate Intrinsic Value, Beginning balance outstanding | $		$ 21,089
Aggregate Intrinsic Value, Exercised	$ 0.6	560	$ 0.1
Aggregate Intrinsic Value, Ending balance outstanding | $		13,119
Aggregate Intrinsic Value, Exercisable | $		$ 9,934

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB
-Name Accounting Standards Codification
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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