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Selected Segment Financial Data, Revenues and Long lived Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Revenues |  |  |  |  |
Revenues | $ 225,735 | $ 216,975 | $ 697,796 | $ 662,971 |
Long lived assets |  |  |  |  |
Long lived assets | 1,386,328 |  | 1,386,328 |  | $ 1,416,825
United States [Member] |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 120,859 | 117,407 | 386,436 | 376,322 |
Long lived assets |  |  |  |  |
Long lived assets | 769,054 |  | 769,054 |  | 752,442
Other [Member] |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 104,876 | $ 99,568 | 311,360 | $ 286,649 |
Long lived assets |  |  |  |  |
Long lived assets | $ 617,274 |  | $ 617,274 |  | $ 664,383

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