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Quarterly Financial Data (Unaudited) - Selected Unaudited Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
[1]
Sep. 30, 2017
[2]
Jun. 30, 2017
[3]
Mar. 31, 2017
[4]
Dec. 31, 2016
[5]
Sep. 30, 2016
[6]
Jun. 30, 2016
[7]
Mar. 31, 2016
[8]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 718,133 $ 958,531 $ 788,673 $ 519,431 $ 641,781 $ 558,543 $ 706,627 $ 729,032 $ 2,984,768 [9] $ 2,635,983 [9] $ 3,070,275 [9]
Gross Profit 121,639 184,621 138,224 90,841 59,286 103,113 111,284 113,030      
Net income (loss) 23,635 92,926 36,459 24,195 546 16,392 21,805 (2,444) 177,215 36,299 (8,839)
Net income (loss) attributable to non-controlling interest (1,881) (1,775) 46 2,279 1,022 284 1,148 (272) (1,331) 2,182 9,144
Net income (loss) attributable to McDermott $ 25,516 $ 94,701 $ 36,413 $ 21,916 $ (476) $ 16,108 $ 20,657 $ (2,172) $ 178,546 $ 34,117 $ (17,983)
Income (loss) per share                      
Basic $ 0.09 [10] $ 0.33 [10] $ 0.13 [10] $ 0.09 [10] $ 0.00 [10] $ 0.07 [10] $ 0.09 [10] $ (0.01) [10] $ 0.65 $ 0.14 $ (0.08)
Diluted $ 0.09 [10] $ 0.33 [10] $ 0.13 [10] $ 0.08 [10] $ 0.00 [10] $ 0.06 [10] $ 0.07 [10] $ (0.01) [10] $ 0.63 $ 0.12 $ (0.08)
[1] Operating results for the fourth quarter of 2017 were primarily driven by higher fabrication and marine activity in the MEA segment and installation progress on the Inpex Ichthys project.
[2] Operating results for the third quarter reflect high quality operational performance, while operating with peak levels of utilization in the MEA segment and progressing on the Inpex Ichthys project.
[3] Operating results for the second quarter of 2017 continued to reflect efficient project execution and higher engineering, fabrication and marine activity and improved productivity on multiple projects primarily in our MEA segment.
[4] The first quarter of 2017 operating results improvement was driven by strong cost management, with significantly lower project costs in our MEA and ASA segments, and improvements in our selling, general and administrative expenses.
[5] Net loss for the quarter ended December 31, 2016 was primarily due to increase in our estimated costs at completion on our Ichthys project in Australia and an impairment charge on Intermac 600. Those were partially offset by productivity improvements and associated cost savings, primarily in our MEA segment.
[6] Net income for the quarter ended September 30, 2016 was influenced by productivity improvements and associated cost savings, primarily in the MEA and ASA segments, partially offset by impairment losses on certain marine assets.
[7] Net income for the quarter ended June 30, 2016 was influenced by productivity improvements and associated cost savings in the MEA and ASA segments.
[8] Net loss for the quarter ended March 31, 2016 was influenced by successful execution and close-out improvements in the AEA segment and productivity improvements and associated cost savings, primarily in the ASA segment, partially offset by impairment losses on the Agile vessel.
[9] Intercompany transactions were not significant during 2017, 2016 and 2015.
[10] May not tie to the Consolidated Statements of Operations due to rounding.