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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment

		2017				2016
Cost		$	6,733,634			$	7,011,178
Accumulated depreciation			(3,559,810	)			(3,369,289	)
		$	3,173,824			$	3,641,889
Rig equipment			2,823,782				3,210,933
Rental equipment			60,179				79,398
Other equipment			66,560				85,731
Vehicles			16,280				22,030
Buildings			71,102				82,335
Assets under construction			102,035				126,430
Land			33,886				35,032
		$	3,173,824			$	3,641,889

Cost

		Rig Equipment				Rental Equipment				Other Equipment				Vehicles				Buildings				Assets Under Construction				Land				Total
Balance, December 31, 2015		$	6,069,179			$	171,220			$	240,192			$	43,552			$	131,164			$	258,952			$	35,587			$	6,949,846
Additions			88,277				92				1,092				166				913				112,932				—				203,472
Additions through business acquisition			28,125				—				—				—				—				—				—				28,125
Re-measurement to fair value before disposal			7,605				—				—				—				—				—				—				7,605
Disposals			(50,384	)			(11,389	)			(4,988	)			(440	)			—				—				—				(67,201	)
Reclassifications			229,012				—				12,874				2,573				702				(245,161	)			—				—
Effect of foreign currency exchange differences			(104,823	)			(779	)			(2,097	)			(704	)			(1,418	)			(293	)			(555	)			(110,669	)
Balance, December 31, 2016			6,266,991				159,144				247,073				45,147				131,361				126,430				35,032				7,011,178
Additions			21,268				71				49				42				235				53,158				—				74,823
Disposals			(71,014	)			(9,758	)			(785	)			(339	)			(930	)			—				—				(82,826	)
Reclassifications			67,779				84				216				113				—				(68,566	)			—				(374	)
Effect of foreign currency exchange differences			(250,858	)			(1,530	)			(1,603	)			(1,762	)			(3,281	)			(8,987	)			(1,146	)			(269,167	)
Balance, December 31, 2017		$	6,034,166			$	148,011			$	244,950			$	43,201			$	127,385			$	102,035			$	33,886			$	6,733,634

Accumulated Depreciation

		Rig Equipment				Rental Equipment				Other Equipment				Vehicles				Buildings				Assets Under Construction				Land				Total
Balance, December 31, 2015		$	2,789,991			$	74,220			$	142,846			$	18,712			$	40,745			$	—			$	—			$	3,066,514
Depreciation expense			342,224				16,039				22,504				5,060				8,591				—				—				394,418
Disposals			(32,427	)			(10,246	)			(3,241	)			(417	)			—				—				—				(46,331	)
Effect of foreign currency exchange differences			(43,730	)			(267	)			(767	)			(238	)			(310	)			—				—				(45,312	)
Balance, December 31, 2016			3,056,058				79,746				161,342				23,117				49,026				—				—				3,369,289
Depreciation expense			334,896				15,159				19,914				5,064				8,488				—				—				383,521
Disposals			(67,304	)			(6,331	)			(592	)			(320	)			(208	)			—				—				(74,755	)
Impairment			15,313				—				—				—				—				—				—				15,313
Effect of foreign currency exchange differences			(128,579	)			(742	)			(2,274	)			(940	)			(1,023	)			—				—				(133,558	)
Balance, December 31, 2017		$	3,210,384			$	87,832			$	178,390			$	26,921			$	56,283			$	—			$	—			$	3,559,810