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Summary of Subsidiaries (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Precision Limited Partnership [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | Canada |
Ownership interest | 100.00% | 100.00%
Precision Drilling Canada Limited Partnership [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | Canada |
Ownership interest | 100.00% | 100.00%
Precision Diversified Oilfield Services Corp [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | Canada |
Ownership interest | 100.00% | 100.00%
Precision Directional Services Ltd [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | Canada |
Ownership interest | 100.00% | 100.00%
Precision Drilling (US) Corporation [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | United States |
Ownership interest | 100.00% | 100.00%
Precision Drilling Company LP [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | United States |
Ownership interest | 100.00% | 100.00%
Precision Completion and Production Services Ltd [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | United States |
Ownership interest | 100.00% | 100.00%
Precision Directional Services Inc [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | United States |
Ownership interest | 100.00% | 100.00%
Grey Wolf Drilling Limited [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | Barbados |
Ownership interest | 100.00% | 100.00%
Grey Wolf Drilling Barbados Ltd [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Country of incorporation | Barbados |
Ownership interest | 100.00% | 100.00%

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- Definition The country in which a subsidiary of the entity is incorporated. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_ii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_ii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_b&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 19B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_c&doctype=Standard -URIDate 2017-03-09 + Details
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