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Revenue by Geographic Area (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Geographical Information [Line Items]      
Total revenues $ 1,629,838 $ 1,495,816 $ 1,394,105
Americas Principally U S      
Schedule Of Geographical Information [Line Items]      
Total revenues 791,568 729,933 647,533
Europe      
Schedule Of Geographical Information [Line Items]      
Total revenues 595,850 550,811 533,717
Asia Middle East And Africa      
Schedule Of Geographical Information [Line Items]      
Total revenues $ 242,420 $ 215,072 $ 212,855