Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Operating revenues	$ 2,017,548	$ 2,134,043	$ 3,043,383
UNITED STATES
Disaggregation of Revenue [Line Items]
Operating revenues	804,807	841,531	1,554,442
Saudi Arabia
Disaggregation of Revenue [Line Items]
Operating revenues	645,000	642,700	696,400
Operating Segments | Lower 48
Disaggregation of Revenue [Line Items]
Operating revenues	679,484	691,963	1,365,077
Operating Segments | U.S. Offshore Gulf Of Mexico
Disaggregation of Revenue [Line Items]
Operating revenues	137,110	135,601	170,262
Operating Segments | Alaska
Disaggregation of Revenue [Line Items]
Operating revenues	29,265	39,221	67,899
Operating Segments | CANADA
Disaggregation of Revenue [Line Items]
Operating revenues	45,057	59,461	78,875
Operating Segments | Middle East & Asia
Disaggregation of Revenue [Line Items]
Operating revenues	807,078	827,501	865,889
Operating Segments | Latin America
Disaggregation of Revenue [Line Items]
Operating revenues	273,485	235,685	373,065
Operating Segments | Europe, Africa & CIS
Disaggregation of Revenue [Line Items]
Operating revenues	102,456	191,440	225,301
Operating Segments | US Segment
Disaggregation of Revenue [Line Items]
Operating revenues	669,656	713,057	1,240,936
Operating Segments | US Segment | Lower 48
Disaggregation of Revenue [Line Items]
Operating revenues	512,880	548,859	1,021,879
Operating Segments | US Segment | U.S. Offshore Gulf Of Mexico
Disaggregation of Revenue [Line Items]
Operating revenues	128,323	126,292	156,931
Operating Segments | US Segment | Alaska
Disaggregation of Revenue [Line Items]
Operating revenues	28,453	37,906	62,126
Operating Segments | Canada Segment
Disaggregation of Revenue [Line Items]
Operating revenues	39,336	54,753	68,274
Operating Segments | Canada Segment | CANADA
Disaggregation of Revenue [Line Items]
Operating revenues	39,336	54,753	68,274
Operating Segments | International Excluding Canada
Disaggregation of Revenue [Line Items]
Operating revenues	1,043,197	1,131,673	1,324,142
Operating Segments | International Excluding Canada | Middle East & Asia
Disaggregation of Revenue [Line Items]
Operating revenues	706,267	728,983	765,493
Operating Segments | International Excluding Canada | Latin America
Disaggregation of Revenue [Line Items]
Operating revenues	251,153	228,930	355,189
Operating Segments | International Excluding Canada | Europe, Africa & CIS
Disaggregation of Revenue [Line Items]
Operating revenues	85,777	173,760	203,460
Operating Segments | Drilling Solutions
Disaggregation of Revenue [Line Items]
Operating revenues	172,473	149,834	252,790
Operating Segments | Drilling Solutions | Lower 48
Disaggregation of Revenue [Line Items]
Operating revenues	97,354	88,919	170,639
Operating Segments | Drilling Solutions | U.S. Offshore Gulf Of Mexico
Disaggregation of Revenue [Line Items]
Operating revenues	8,787	9,309	13,331
Operating Segments | Drilling Solutions | Alaska
Disaggregation of Revenue [Line Items]
Operating revenues	753	1,296	4,787
Operating Segments | Drilling Solutions | CANADA
Disaggregation of Revenue [Line Items]
Operating revenues	1,342	1,137	1,749
Operating Segments | Drilling Solutions | Middle East & Asia
Disaggregation of Revenue [Line Items]
Operating revenues	40,492	40,255	43,941
Operating Segments | Drilling Solutions | Latin America
Disaggregation of Revenue [Line Items]
Operating revenues	22,104	6,578	15,558
Operating Segments | Drilling Solutions | Europe, Africa & CIS
Disaggregation of Revenue [Line Items]
Operating revenues	1,641	2,340	2,785
Operating Segments | Rig Services
Disaggregation of Revenue [Line Items]
Operating revenues	149,273	131,555	260,226
Operating Segments | Rig Services | Lower 48
Disaggregation of Revenue [Line Items]
Operating revenues	69,250	54,185	172,559
Operating Segments | Rig Services | Alaska
Disaggregation of Revenue [Line Items]
Operating revenues	59	19	986
Operating Segments | Rig Services | CANADA
Disaggregation of Revenue [Line Items]
Operating revenues	4,379	3,571	8,852
Operating Segments | Rig Services | Middle East & Asia
Disaggregation of Revenue [Line Items]
Operating revenues	60,319	58,263	56,455
Operating Segments | Rig Services | Latin America
Disaggregation of Revenue [Line Items]
Operating revenues	228	177	2,318
Operating Segments | Rig Services | Europe, Africa & CIS
Disaggregation of Revenue [Line Items]
Operating revenues	15,038	15,340	19,056
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Operating revenues	(56,387)	(46,829)	(102,985)
Intersegment Eliminations | Other.
Disaggregation of Revenue [Line Items]
Operating revenues	$ (56,387)	$ (46,829)	$ (102,985)