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Selected Segment Financial Data, Revenues and Long lived Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Revenues |  |  |  |  |
Revenues | $ 240,599 | $ 219,930 | $ 472,061 | $ 445,996 |
Long lived assets |  |  |  |  |
Long lived assets | 1,400,983 |  | 1,400,983 |  | $ 1,416,825
United States [Member] |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 130,576 | 125,550 | 265,578 | 258,915 |
Long lived assets |  |  |  |  |
Long lived assets | 777,902 |  | 777,902 |  | 752,442
United Kingdom [Member] |  |  |  |  |
Long lived assets |  |  |  |  |
Long lived assets | 203,509 |  | 203,509 |  | 204,193
Other [Member] |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 110,023 | $ 94,380 | 206,483 | $ 187,081 |
Long lived assets |  |  |  |  |
Long lived assets | $ 419,572 |  | $ 419,572 |  | $ 460,190

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