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Revenue by Geographic Area (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Geographical Information [Line Items]      
Total revenues $ 1,741,301 $ 1,629,838 $ 1,495,816
Americas Principally U S      
Schedule Of Geographical Information [Line Items]      
Total revenues 847,458 791,568 729,933
Europe      
Schedule Of Geographical Information [Line Items]      
Total revenues 627,524 595,850 550,811
Asia-Pacific, Middle-East and Africa      
Schedule Of Geographical Information [Line Items]      
Total revenues $ 266,319 $ 242,420 $ 215,072