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Summary of Operating Segments by Geographic Locations (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of geographical areas [Line Items] |  |
Revenue | $ 1,541,189 | $ 1,321,224
Total assets | 3,636,043 | 3,892,931
Eliminations [Member] |  |
Disclosure of geographical areas [Line Items] |  |
Revenue | (18,799) | (16,567)
Canada [Member] |  |
Disclosure of geographical areas [Line Items] |  |
Revenue | 558,746 | 562,250
Total assets | 1,269,542 | 1,631,838
Canada [Member] | Before Eliminations [Member] |  |
Disclosure of geographical areas [Line Items] |  |
Revenue | 571,640 | 578,817
United States [Member] |  |
Disclosure of geographical areas [Line Items] |  |
Revenue | 791,312 | 568,573
Total assets | 1,772,850 | 1,666,368
United States [Member] | Before Eliminations [Member] |  |
Disclosure of geographical areas [Line Items] |  |
Revenue | 797,217 | 568,573
International [Member] |  |
Disclosure of geographical areas [Line Items] |  |
Revenue | 191,131 | 190,401
Total assets | $ 593,651 | $ 594,725

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