Segment Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financial information with respect to reportable segments
Number of reportable segments | segment	5
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	$ 2,017,548	$ 2,134,043	$ 3,043,383
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(80,787)	(171,461)	89,145
Earnings (losses) from unconsolidated affiliates			(5)
Investment income (loss)	1,557	1,438	10,218
Interest expense	(171,476)	(206,274)	(204,311)
(Gain)/loss on debt buybacks and exchanges	13,423	228,274	11,468
Impairments and other charges	(66,731)	(410,631)	(301,939)
Other, net	(53,421)	(28,567)	(33,224)
Income (loss) from continuing operations before income taxes	(488,089)	(705,567)	(588,922)
Depreciation and amortization:
Depreciation and amortization	693,381	853,699	876,091
Capital expenditures
Capital expenditures	243,689	189,706	423,967
ASSETS
Total assets (1)	5,525,364	5,503,428
Operating Segments
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(80,787)	(171,461)	89,145
Intersegment Eliminations
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	(56,387)	(46,829)	(102,985)
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(130,654)	(118,346)	(160,274)
Depreciation and amortization:
Depreciation and amortization	(2,866)	(2,383)	8,758
Capital expenditures
Capital expenditures	1,089	251	(5,676)
ASSETS
Total assets (1)	1,280,198	443,153
US Segment | Operating Segments
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	669,656	713,057	1,240,936
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(76,492)	(96,176)	64,313
Depreciation and amortization:
Depreciation and amortization	326,361	398,326	419,680
Capital expenditures
Capital expenditures	53,875	44,606	184,705
ASSETS
Total assets (1)	1,606,683	1,871,008
Canada Segment | Operating Segments
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	39,336	54,753	68,274
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	2,893	(11,766)	(14,483)
Depreciation and amortization:
Depreciation and amortization	11,604	24,784	29,766
Capital expenditures
Capital expenditures	2,938	2,018	5,020
ASSETS
Total assets (1)	1,392	174,123
International Excluding Canada | Operating Segments
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	1,043,197	1,131,673	1,324,142
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	(40,117)	(56,205)	(8,903)
Depreciation and amortization:
Depreciation and amortization	323,431	377,599	372,883
Capital expenditures
Capital expenditures	173,078	127,888	209,728
ASSETS
Total assets (1)	2,380,703	2,688,912
Drilling Solutions | Operating Segments
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	172,473	149,834	252,790
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	32,771	6,167	59,465
Depreciation and amortization:
Depreciation and amortization	26,660	40,074	32,289
Capital expenditures
Capital expenditures	9,919	12,306	23,598
ASSETS
Total assets (1)	65,899	100,278
Rig Technologies | Operating Segments
Operating revenues and earnings (losses) from unconsolidated affiliates:
Total operating revenues	149,273	131,555	260,226
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes:
Adjusted operating income (loss)	158	(13,481)	(11,247)
Depreciation and amortization:
Depreciation and amortization	8,191	15,299	12,715
Capital expenditures
Capital expenditures	2,790	2,637	$ 6,592
ASSETS
Total assets (1)	$ 190,489	$ 225,954