Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	$ 460,511	$ 718,364
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(35,920)	(9,116)
Investment income (loss)	1,263	(3,198)
Interest expense	(42,975)	(54,722)
Impairments and other charges	(2,483)	(276,434)
Other, net	(4,863)	17,110
Income (loss) from continuing operations before income taxes	(118,604)	(356,576)
ASSETS
Total assets	5,254,906		$ 5,503,428
Operating segment
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(35,920)	(9,116)
Other reconciling items
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(33,626)	(30,216)
ASSETS
Total assets	435,790		443,153
U.S. Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	142,299	274,901
U.S. Drilling | Operating segment
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	142,299	274,901
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(23,336)	(7,404)
ASSETS
Total assets	1,804,430		1,871,008
Canada Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	20,989	25,591
Canada Drilling | Operating segment
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	20,989	25,591
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	3,907	37
ASSETS
Total assets	179,981		174,123
International Drilling
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	246,838	337,110
International Drilling | Operating segment
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	246,838	337,110
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(18,632)	(4,147)
ASSETS
Total assets	2,537,288		2,688,912
Drilling Solutions
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	35,706	55,384
Drilling Solutions | Operating segment
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	35,706	55,384
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	4,710	10,549
ASSETS
Total assets	90,971		100,278
Rig Technologies | Operating segment
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(2,569)	$ (8,151)
ASSETS
Total assets	$ 206,446		$ 225,954