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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