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Selected Financial Information by Reportable Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | [1] | Sep. 30, 2020 | [1] | Jun. 30, 2020 | [1] | Mar. 31, 2020 | [1] | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 98,242 | $ 35,478 | $ 8,974 | $ 543,616 | $ 788,803 | $ 821,817 | $ 957,756 | $ 714,723 | $ 686,310 | [1] | $ 3,283,099 | $ 3,221,735
Adjusted EBITDA | [2] |  |  |  |  |  |  |  |  | (276,880) |  | 745,045 | 781,517
Capital expenditures |  |  |  |  |  |  |  |  |  | 83,930 |  | 303,627 | 346,073
U.S. Operating Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [3] |  |  |  |  |  |  |  |  | 556,909 |  | 2,580,903 | 2,538,957
International Operating Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 129,401 |  | 702,196 | 682,778
Operating Segments | U.S. Operating Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 559,184 |  | 2,594,246 | 2,551,719
Adjusted EBITDA | [2] |  |  |  |  |  |  |  |  | (226,981) |  | 615,161 | 648,576
Capital expenditures |  |  |  |  |  |  |  |  |  | 64,026 |  | 230,561 | 270,870
Operating Segments | International Operating Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 129,401 |  | 702,196 | 682,778
Adjusted EBITDA | [2] |  |  |  |  |  |  |  |  | (49,899) |  | 129,884 | 132,941
Capital expenditures |  |  |  |  |  |  |  |  |  | 19,904 |  | 73,066 | 75,203
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ (2,275) |  | $ (13,343) | $ (12,762)
[1] | Quarterly results during the year ended December 31, 2020 were impacted by the COVID-19 pandemic (see Note 3) as well as impairment recorded (see Notes 1 and 11).
[2] | Distributions from equity investees are reported entirely within the U.S. operating segment.
[3] | U.S. segment revenues exclude intercompany transactions with the international operating segment. See Note 21 for additional information on intercompany eliminations.

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