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Goodwill - Additional Information (Detail) - CAD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of information for cash-generating units [Line Items] |  |  |
Goodwill | $ 205,167 | $ 207,399 | $ 208,479
Projected cash flows period | five-year |  |
Canada Contract Drilling CGU [member] |  |  |
Disclosure of information for cash-generating units [Line Items] |  |  |
Goodwill | $ 172,300 |  |
Discount rate | 9.72% | 11.60% |
Growth rates | 0.00% | 0.00% |
Percentage increase in discount rates resulted in additional impairment | 0.50% |  |
Impairment charge | $ 39,400 |  |
Canada Contract Drilling CGU [member] | Top of Range [Member] |  |  |
Disclosure of information for cash-generating units [Line Items] |  |  |
Percentage of discount rate resulted in impairment | 13.44% |  |
U.S. Directional Drilling CGU [member] |  |  |
Disclosure of information for cash-generating units [Line Items] |  |  |
Goodwill | $ 32,900 |  |
Discount rate | 11.72% | 13.61% |
Growth rates | 0.00% | 0.00% |
Percentage increase in discount rates resulted in additional impairment | 0.50% |  |
Impairment charge | $ 900 |  |
U.S. Directional Drilling CGU [member] | Top of Range [Member] |  |  |
Disclosure of information for cash-generating units [Line Items] |  |  |
Percentage of discount rate resulted in impairment | 19.21% |  |

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- Definition The explanation of the period over which management has projected cash flows based on financial budgets/forecasts approved by management including, when a period greater than five years is used for a cash-generating unit (group of units), an explanation of why that longer period is justified. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2016-01-13 -Paragraph 134 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2016-03-30&anchor=para_134_d_iii&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2016-01-13 -Paragraph 134 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2016-03-30&anchor=para_134_e_iii&doctype=Standard -URIDate 2016-03-31 + Details
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