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Change in Property, Plant and Equipment (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | $ 3,641,889 |
Impairment | 15,313 |
Ending Balance | 3,173,824 | $ 3,641,889
Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 7,011,178 | 6,949,846
Additions | 74,823 | 203,472
Additions through business acquisition |  | 28,125
Re-measurement to fair value before disposal |  | 7,605
Disposals | (82,826) | (67,201)
Reclassifications | (374) |
Effect of foreign currency exchange differences | (269,167) | (110,669)
Ending Balance | 6,733,634 | 7,011,178
Accumulated Depreciation [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 3,369,289 | 3,066,514
Depreciation expense | 383,521 | 394,418
Disposals | (74,755) | (46,331)
Impairment | 15,313 |
Effect of foreign currency exchange differences | (133,558) | (45,312)
Ending Balance | 3,559,810 | 3,369,289
Rig Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 3,210,933 |
Ending Balance | 2,823,782 | 3,210,933
Rig Equipment [Member] | Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 6,266,991 | 6,069,179
Additions | 21,268 | 88,277
Additions through business acquisition |  | 28,125
Re-measurement to fair value before disposal |  | 7,605
Disposals | (71,014) | (50,384)
Reclassifications | 67,779 | 229,012
Effect of foreign currency exchange differences | (250,858) | (104,823)
Ending Balance | 6,034,166 | 6,266,991
Rig Equipment [Member] | Accumulated Depreciation [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 3,056,058 | 2,789,991
Depreciation expense | 334,896 | 342,224
Disposals | (67,304) | (32,427)
Impairment | 15,313 |
Effect of foreign currency exchange differences | (128,579) | (43,730)
Ending Balance | 3,210,384 | 3,056,058
Rental Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 79,398 |
Ending Balance | 60,179 | 79,398
Rental Equipment [Member] | Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 159,144 | 171,220
Additions | 71 | 92
Disposals | (9,758) | (11,389)
Reclassifications | 84 |
Effect of foreign currency exchange differences | (1,530) | (779)
Ending Balance | 148,011 | 159,144
Rental Equipment [Member] | Accumulated Depreciation [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 79,746 | 74,220
Depreciation expense | 15,159 | 16,039
Disposals | (6,331) | (10,246)
Effect of foreign currency exchange differences | (742) | (267)
Ending Balance | 87,832 | 79,746
Other Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 85,731 |
Ending Balance | 66,560 | 85,731
Other Equipment [Member] | Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 247,073 | 240,192
Additions | 49 | 1,092
Disposals | (785) | (4,988)
Reclassifications | 216 | 12,874
Effect of foreign currency exchange differences | (1,603) | (2,097)
Ending Balance | 244,950 | 247,073
Other Equipment [Member] | Accumulated Depreciation [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 161,342 | 142,846
Depreciation expense | 19,914 | 22,504
Disposals | (592) | (3,241)
Effect of foreign currency exchange differences | (2,274) | (767)
Ending Balance | 178,390 | 161,342
Vehicles [member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 22,030 |
Ending Balance | 16,280 | 22,030
Vehicles [member] | Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 45,147 | 43,552
Additions | 42 | 166
Disposals | (339) | (440)
Reclassifications | 113 | 2,573
Effect of foreign currency exchange differences | (1,762) | (704)
Ending Balance | 43,201 | 45,147
Vehicles [member] | Accumulated Depreciation [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 23,117 | 18,712
Depreciation expense | 5,064 | 5,060
Disposals | (320) | (417)
Effect of foreign currency exchange differences | (940) | (238)
Ending Balance | 26,921 | 23,117
Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 82,335 |
Ending Balance | 71,102 | 82,335
Buildings [Member] | Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 131,361 | 131,164
Additions | 235 | 913
Disposals | (930) |
Reclassifications |  | 702
Effect of foreign currency exchange differences | (3,281) | (1,418)
Ending Balance | 127,385 | 131,361
Buildings [Member] | Accumulated Depreciation [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 49,026 | 40,745
Depreciation expense | 8,488 | 8,591
Disposals | (208) |
Effect of foreign currency exchange differences | (1,023) | (310)
Ending Balance | 56,283 | 49,026
Assets Under Construction [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 126,430 |
Ending Balance | 102,035 | 126,430
Assets Under Construction [Member] | Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 126,430 | 258,952
Additions | 53,158 | 112,932
Reclassifications | (68,566) | (245,161)
Effect of foreign currency exchange differences | (8,987) | (293)
Ending Balance | 102,035 | 126,430
Land [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 35,032 |
Ending Balance | 33,886 | 35,032
Land [Member] | Gross [Member] |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |
Beginning Balance | 35,032 | 35,587
Effect of foreign currency exchange differences | (1,146) | (555)
Ending Balance | $ 33,886 | $ 35,032

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