Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	$ 533,931	$ 771,406	$ 1,252,295	$ 1,571,046
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(28,673)	22,260	(37,789)	48,954
Earnings (losses) from unconsolidated affiliates				(5)
Investment income (loss)	2,036	469	(1,162)	10,146
Interest expense	(51,206)	(51,491)	(105,928)	(103,843)
Remeasurement of net monetary assets charge	57,852	102,570	334,286	99,903
Other, net	30,795	(7,899)	47,905	(28,068)
Income (loss) from continuing operations before income taxes	(133,522)	(181,403)	(490,098)	(254,980)
ASSETS
Total assets (1)	5,982,415		5,982,415		$ 6,760,658
U.S. Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	173,784	323,402	448,685	643,611
Canada Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	3,564	11,389	29,155	36,704
International Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	301,078	326,905	638,188	664,161
Drilling Solutions
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	33,129	64,583	88,513	130,005
Rig Technologies
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	33,582	72,751	75,732	144,504
Operating segment
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(28,673)	22,260	(37,789)	48,954
Operating segment | U.S. Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	173,784	323,402	448,685	643,611
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(23,395)	20,392	(30,799)	45,075
ASSETS
Total assets (1)	2,091,100		2,091,100		2,369,200
Operating segment | Canada Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	3,564	11,389	29,155	36,704
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(5,795)	(5,537)	(5,758)	(5,596)
ASSETS
Total assets (1)	163,694		163,694		202,706
Operating segment | International Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	301,078	326,905	638,188	664,161
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	276	(6,884)	(3,871)	(12,521)
ASSETS
Total assets (1)	2,818,800		2,818,800		2,979,494
Operating segment | Drilling Solutions
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	33,129	64,583	88,513	130,005
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	1,733	13,793	12,282	26,648
ASSETS
Total assets (1)	130,035		130,035		218,004
Operating segment | Rig Technologies
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	33,582	72,751	75,732	144,504
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(1,492)	496	(9,643)	(4,652)
ASSETS
Total assets (1)	247,021		247,021		324,523
Other reconciling items (3)
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	11,206	27,624	27,978	47,939
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(28,622)	$ (42,172)	(58,838)	$ (82,261)
ASSETS
Total assets (1)	$ 531,765		$ 531,765		$ 666,731