Summary of Goodwill (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2018 CAD ($)
Disclosure Of Reconciliation Of Changes In Goodwill [Abstract]
Goodwill at beginning of period	$ 205,167
Impairment charge	(207,544)
Exchange adjustment	2,377
Goodwill at end of period	$ 0

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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