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Selected Financial Information by Reportable Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 749,994 | $ 710,748 | $ 751,195 | $ 779,610 | $ 700,918 | $ 768,574 | $ 744,404 | $ 704,869 | $ 2,991,547 | $ 2,918,765 | $ 2,852,609
Adjusted EBITDA | [1] |  |  |  |  |  |  |  |  | 723,758 | 706,103 | 682,782
Capital expenditures |  |  |  |  |  |  |  |  |  | 380,862 | 326,908 | 331,726
Operating Segments | U.S. Operating Segment |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,236,237 | 2,230,693 | 2,137,733
Adjusted EBITDA | [1] |  |  |  |  |  |  |  |  | 558,182 | 548,413 | 516,366
Capital expenditures |  |  |  |  |  |  |  |  |  | 321,040 | 242,271 | 223,213
Operating Segments | International Operating Segment |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 769,436 | 701,573 | 728,735
Adjusted EBITDA | [1] |  |  |  |  |  |  |  |  | 165,576 | 157,690 | 166,416
Capital expenditures |  |  |  |  |  |  |  |  |  | 59,822 | 84,637 | 108,513
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ (14,126) | $ (13,501) | $ (13,859)
[1] | Distributions from equity investees are reported entirely within the U.S. operating segment

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