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Goodwill and Intangible Assets, Net - Schedule of Goodwill by Reportable Segment (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill [Line Items]  
Goodwill, Beginning balance $ 1,545,761
Foreign exchange translation adjustment (1,683)
Goodwill, Ending balance 1,544,078
Index [Member]  
Goodwill [Line Items]  
Goodwill, Beginning balance 1,203,404
Foreign exchange translation adjustment (1,041)
Goodwill, Ending balance 1,202,363
Analytics [Member]  
Goodwill [Line Items]  
Goodwill, Beginning balance 290,976
Goodwill, Ending balance 290,976
All Other [Member]  
Goodwill [Line Items]  
Goodwill, Beginning balance 51,381
Foreign exchange translation adjustment (642)
Goodwill, Ending balance $ 50,739