Summary of Goodwill (Detail) - CAD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Reconciliation Of Changes In Goodwill [Abstract]
Goodwill at beginning of period	$ 207,399	$ 208,479
Exchange adjustment	(2,232)	(1,080)
Goodwill at end of period	$ 205,167	$ 207,399

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]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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