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Segment Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 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 | $ 708,277 | $ 662,103 | $ 631,355 | $ 562,550 | $ 538,948 | $ 519,729 | $ 571,591 | $ 597,571 | $ 2,564,285 | $ 2,227,839 | $ 3,864,437
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | (141,937) | (118,335) | 316,841
Earnings (losses) from unconsolidated affiliates |  |  |  |  |  |  |  |  | 7 | (221,914) | (75,081)
Investment income (loss) |  |  |  |  |  |  |  |  | 1,194 | 1,183 | 2,308
Interest expense |  |  |  |  |  |  |  |  | (222,889) | (185,360) | (181,928)
Impairments and other charges |  |  |  |  |  |  |  |  | (44,536) | (498,499) | (368,967)
Other, net |  |  |  |  |  |  |  |  | (14,880) | (44,174) | 39,172
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (580,084) | (1,198,075) | (427,535)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (82,970) | (186,831) | (98,038)
Income (loss) from continuing operations, net of tax | (114,725) | (119,285) | (115,476) | (147,628) | (330,196) | (97,839) | (186,565) | (396,644) | (497,114) | (1,011,244) | (329,497)
Income (loss) from discontinued operations, net of tax | (442) | (27,134) | (15,504) | (439) | (4,266) | (12,187) | (984) | (926) | (43,519) | (18,363) | (42,797)
Net income (loss) | (115,167) | (146,419) | (130,980) | (148,067) | (334,462) | (110,026) | (187,549) | (397,570) | (540,633) | (1,029,607) | (372,294)
Less: Net (income) loss attributable to noncontrolling interest | (1,177) | (2,113) | (1,971) | (917) | (1,125) | (1,185) | 2,899 | (724) | (6,178) | (135) | (381)
Net income (loss) attributable to Nabors | (116,344) | $ (148,532) | $ (132,951) | $ (148,984) | (335,587) | $ (111,211) | $ (184,650) | $ (398,294) | (546,811) | (1,029,742) | (372,675)
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | 8,401,984 |  |  |  | 8,187,015 |  |  |  | 8,401,984 | 8,187,015 |
Assets held for sale | 37,052 |  |  |  | 76,668 |  |  |  | 37,052 | 76,668 |
Equity in earnings (losses) from unconsolidated affiliates, net |  |  |  |  |  |  |  |  | 7 | (221,914) | (84,275)
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 842,943 | 871,631 | 970,459
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | 600,909 | 414,379 | 923,236
C&J Energy Services, Ltd. |  |  |  |  |  |  |  |  |  |  |
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Earnings (losses) from unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (221,933) | (81,260)
Impairments and other charges |  |  |  |  |  |  |  |  |  | (216,200) |
Operating segment | Reportable subsegments |  |  |  |  |  |  |  |  |  |  |
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | (141,937) | (118,335) | 316,841
Operating segment | Drilling & Rig Technologies |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 2,737,455 | 2,330,144 | 3,647,942
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | 7,733,989 |  |  |  | 7,461,879 |  |  |  | 7,733,989 | 7,461,879 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 843,239 | 875,032 | 917,361
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | 609,182 | 380,941 | 840,673
Operating segment | Drilling & Rig Technologies | Reportable subsegments |  |  |  |  |  |  |  |  |  |  |
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | (141,937) | (118,335) | 375,643
Operating segment | Drilling & Rig Technologies | Reportable subsegments | U.S. |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 805,223 | 554,072 | 1,256,989
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | (213,877) | (197,710) | 87,051
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | 3,203,560 |  |  |  | 3,172,767 |  |  |  | 3,203,560 | 3,172,767 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 375,171 | 388,367 | 425,952
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | 330,875 | 183,146 | 224,819
Operating segment | Drilling & Rig Technologies | Reportable subsegments | Canada |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 82,929 | 51,472 | 137,494
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | (22,262) | (36,818) | (7,029)
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | 347,773 |  |  |  | 329,620 |  |  |  | 347,773 | 329,620 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 39,597 | 42,143 | 46,786
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | 17,197 | 4,546 | 24,167
Operating segment | Drilling & Rig Technologies | Reportable subsegments | International |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 1,474,060 | 1,508,890 | 1,862,393
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | 108,428 | 164,677 | 308,262
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | 3,540,829 |  |  |  | 3,600,057 |  |  |  | 3,540,829 | 3,600,057 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 400,753 | 411,372 | 411,004
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | 159,817 | 169,640 | 578,896
Operating segment | Drilling & Rig Technologies | Reportable subsegments | Drilling Solutions |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 140,701 | 63,759 | 69,828
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | 16,738 | (16,503) | (10,879)
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | 182,162 |  |  |  | 81,490 |  |  |  | 182,162 | 81,490 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,188 | 18,598 | 11,221
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | 58,925 | 21,606 | 5,506
Operating segment | Drilling & Rig Technologies | Reportable subsegments | Rig Technologies |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 234,542 | 151,951 | 321,238
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | (30,964) | (31,981) | (1,762)
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | 459,665 |  |  |  | 277,945 |  |  |  | 459,665 | 277,945 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,530 | 14,552 | 22,398
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | 42,368 | 2,003 | 7,285
Operating segment | Completion and Production Services |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 366,372
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 53,735
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  | 45,691
Operating segment | Completion and Production Services | Reportable subsegments |  |  |  |  |  |  |  |  |  |  |
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  |  |  | (58,802)
Operating segment | Completion and Production Services | Reportable subsegments | Completion Services |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 207,860
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  |  |  | (55,243)
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 27,133
Operating segment | Completion and Production Services | Reportable subsegments | Production Services |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | 158,512
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  |  |  | (3,559)
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 26,602
Other reconciling items (1) |  |  |  |  |  |  |  |  |  |  |
Operating revenues and earnings (losses) from unconsolidated affiliates: |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | (173,170) | (102,305) | (149,877)
Reconciliation of segment adjusted operating income (loss) to net income (loss) from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |
Adjusted income (loss) derived from operating activities |  |  |  |  |  |  |  |  | (157,043) | (130,976) | (159,880)
ASSETS |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 667,995 |  |  |  | $ 725,136 |  |  |  | 667,995 | 725,136 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | (296) | (3,401) | (637)
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |
Capital expenditures and acquisitions of businesses |  |  |  |  |  |  |  |  | $ (8,273) | $ 33,438 | $ 36,872

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