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Accumulated other comprehensive income (loss) - Schedule of Accumulated Other Comprehensive Income (loss) (Detail) - CAD CAD in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | CAD 2,485,921 | CAD 2,291,864
Other comprehensive loss, net of tax | (253,774) | (38,636)
Ending Balance | 4,165,037 | 2,485,921
Foreign currency cumulative translation |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | 200,328 | 261,357
OCI (loss) before reclassifications | (200,400) | (61,029)
Amounts reclassified | 0 | 0
Other comprehensive loss, net of tax | (200,400) | (61,029)
Ending Balance | (72) | 200,328
Unrealized gain on cash flow hedges |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | 66,083 | 39,329
OCI (loss) before reclassifications | 8,714 | 34,308
Amounts reclassified | (6,805) | (7,554)
Other comprehensive loss, net of tax | 1,909 | 26,754
Ending Balance | 67,992 | 66,083
Net change on available-for-sale investments |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | 141 | (72)
OCI (loss) before reclassifications | 0 | 213
Amounts reclassified | (141) | 0
Other comprehensive loss, net of tax | (141) | 213
Ending Balance | 0 | 141
Pension and post-employment actuarial changes |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | (11,625) | (13,877)
OCI (loss) before reclassifications | 838 | 2,856
Amounts reclassified | (313) | (604)
Other comprehensive loss, net of tax | 525 | 2,252
Ending Balance | (11,100) | (11,625)
Accumulated OCI |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | 254,927 | 286,737
OCI (loss) before reclassifications | (190,848) | (23,652)
Amounts reclassified | (7,259) | (8,158)
Other comprehensive loss, net of tax | (198,107) | (31,810)
Ending Balance | CAD 56,820 | CAD 254,927

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details
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