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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment

		2018				2017
Cost		$	6,937,062			$	6,733,634
Accumulated depreciation			(3,898,450	)			(3,559,810	)
		$	3,038,612			$	3,173,824
Rig equipment			2,745,172				2,823,782
Rental equipment			43,992				60,179
Other equipment			52,195				66,560
Vehicles			12,702				16,280
Buildings			65,561				71,102
Assets under construction			84,561				102,035
Land			34,429				33,886
		$	3,038,612			$	3,173,824

Cost

		Rig Equipment				Rental Equipment				Other Equipment				Vehicles				Buildings				Assets Under Construction				Land				Total
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
Additions			7,013				—				347				—				569				106,647				—				114,576
Disposals			(32,153	)			(18,227	)			(59,865	)			(228	)			(3,663	)			—				(893	)			(115,029	)
Reclassifications			127,668				—				507				—				—				(128,175	)			—				—
Reclassification to assets held for sale			(135,398	)			—				—				—				—				—				—				(135,398	)
Effect of foreign currency exchange differences			321,240				679				5,351				2,483				4,036				4,054				1,436				339,279
Balance, December 31, 2018		$	6,322,536			$	130,463			$	191,290			$	45,456			$	128,327			$	84,561			$	34,429			$	6,937,062

Accumulated Depreciation

		Rig Equipment				Rental Equipment				Other Equipment				Vehicles				Buildings				Assets Under Construction				Land				Total
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
Depreciation expense			335,215				9,418				15,993				4,820				8,126				—				—				373,572
Disposals			(28,399	)			(11,249	)			(59,857	)			(220	)			(3,161	)			—				—				(102,886	)
Reclassification to assets held for sale			(115,740	)			—				—				—				—				—				—				(115,740	)
Effect of foreign currency exchange differences			175,904				470				4,569				1,233				1,518				—				—				183,694
Balance, December 31, 2018		$	3,577,364			$	86,471			$	139,095			$	32,754			$	62,766			$	—			$	—			$	3,898,450