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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | $ 758,076 | $ 779,425 | $ 2,329,122 | $ 2,275,539
U.S. Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 307,808 | 273,996 | 951,419 | 779,393
Canada Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 12,191 | 26,645 | 48,895 | 75,974
International Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 328,278 | 377,125 | 992,439 | 1,123,956
Drilling Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 62,286 | 60,923 | 192,291 | 183,430
Rig Technologies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 63,106 | 63,641 | 207,610 | 209,631
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | (15,593) | (22,905) | (63,532) | (96,845)
Operating segment | Lower 48 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 338,519 | 319,687 | 1,061,777 | 937,527
Operating segment | Offshore Gulf Of Mexico [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 40,300 | 35,287 | 127,517 | 94,452
Operating segment | ALASKA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 15,294 | 11,576 | 54,234 | 41,724
Operating segment | Canada Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 14,443 | 31,209 | 57,250 | 97,867
Operating segment | Middle East And Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 222,743 | 243,934 | 639,581 | 746,743
Operating segment | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 90,571 | 99,051 | 279,767 | 281,967
Operating segment | Europe Africa And CIS [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 51,799 | 61,586 | 172,528 | 172,104
Operating segment | U.S. Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 307,808 | 273,996 | 951,419 | 779,393
Operating segment | U.S. Drilling | Lower 48 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 256,978 | 231,935 | 784,638 | 655,916
Operating segment | U.S. Drilling | Offshore Gulf Of Mexico [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 37,365 | 31,942 | 117,572 | 84,997
Operating segment | U.S. Drilling | ALASKA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 13,465 | 10,119 | 49,209 | 38,480
Operating segment | Canada Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 12,191 | 26,645 | 48,895 | 75,974
Operating segment | Canada Drilling | Canada Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 12,191 | 26,645 | 48,895 | 75,974
Operating segment | International Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 328,278 | 377,125 | 992,439 | 1,123,956
Operating segment | International Drilling | Middle East And Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 197,095 | 226,926 | 570,142 | 701,292
Operating segment | International Drilling | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 85,558 | 94,048 | 266,715 | 265,738
Operating segment | International Drilling | Europe Africa And CIS [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 45,625 | 56,151 | 155,582 | 156,926
Operating segment | Drilling Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 62,286 | 60,923 | 192,291 | 183,430
Operating segment | Drilling Solutions | Lower 48 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 41,459 | 42,045 | 132,156 | 127,733
Operating segment | Drilling Solutions | Offshore Gulf Of Mexico [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 2,935 | 3,345 | 9,945 | 9,455
Operating segment | Drilling Solutions | ALASKA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 1,488 | 1,248 | 4,137 | 2,691
Operating segment | Drilling Solutions | Canada Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 358 | 1,081 | 1,413 | 4,797
Operating segment | Drilling Solutions | Middle East And Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 11,167 | 9,126 | 31,095 | 25,859
Operating segment | Drilling Solutions | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 4,545 | 3,399 | 11,202 | 11,048
Operating segment | Drilling Solutions | Europe Africa And CIS [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 334 | 679 | 2,343 | 1,847
Operating segment | Rig Technologies |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 63,106 | 63,641 | 207,610 | 209,631
Operating segment | Rig Technologies | Lower 48 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 40,082 | 45,707 | 144,983 | 153,878
Operating segment | Rig Technologies | ALASKA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 341 | 209 | 888 | 553
Operating segment | Rig Technologies | Canada Drilling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 1,894 | 3,483 | 6,942 | 17,096
Operating segment | Rig Technologies | Middle East And Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 14,481 | 7,882 | 38,344 | 19,592
Operating segment | Rig Technologies | Latin America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 468 | 1,604 | 1,850 | 5,181
Operating segment | Rig Technologies | Europe Africa And CIS [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 5,840 | 4,756 | 14,603 | 13,331
Other reconciling items (1) | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | (15,593) | (22,905) | (63,532) | (96,845)
Other reconciling items (1) | Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | (15,593) | (22,905) | (63,532) | (96,845)
Other reconciling items (3) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | $ 15,593 | $ 22,905 | $ 63,532 | $ 96,845

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