Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	$ 718,364	$ 799,640
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(9,116)	26,694
Earnings (losses) from unconsolidated affiliates		(5)
Investment income (loss)	(3,198)	9,677
Interest expense	(54,722)	(52,352)
Remeasurement of net monetary assets charge	276,434
Other, net	17,110	(17,502)
Income (loss) from continuing operations before income taxes	(356,576)	(73,577)
ASSETS
Total assets (1)	6,308,548		$ 6,760,658
U.S. Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	274,901	320,209
Canada Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	25,591	25,315
International Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	337,110	337,256
Drilling Solutions
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	55,384	65,422
Rig Technologies
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	42,150	71,753
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	(9,116)	26,694
Operating segment | U.S. Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	274,901	320,209
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(7,404)	24,683
ASSETS
Total assets (1)	2,185,051		2,369,200
Operating segment | Canada Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	25,591	25,315
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	37	(59)
ASSETS
Total assets (1)	186,632		202,706
Operating segment | International Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	337,110	337,256
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(4,147)	(5,637)
ASSETS
Total assets (1)	2,943,739		2,979,494
Operating segment | Drilling Solutions
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	55,384	65,422
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	10,549	12,855
ASSETS
Total assets (1)	147,462		218,004
Operating segment | Rig Technologies
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	42,150	71,753
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(8,151)	(5,148)
ASSETS
Total assets (1)	245,347		324,523
Other reconciling items (3)
Operating revenues and earnings (losses) from unconsolidated affiliates:
Operating revenues	16,772	20,315
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted income (loss) derived from operating activities	(30,216)	$ (40,089)
ASSETS
Total assets (1)	$ 600,317		$ 666,731