Goodwill and Intangible Assets, Net - Schedule of Change to Company's Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, Beginning balance	$ 1,566,022	$ 1,562,868
Acquisitions	670,874
Foreign exchange translation adjustment	(510)	3,154
Goodwill, Ending balance	2,236,386	1,566,022
Index [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	1,205,758	1,204,694
Foreign exchange translation adjustment	(315)	1,064
Goodwill, Ending balance	1,205,443	1,205,758
Analytics [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	290,976	290,976
Goodwill, Ending balance	290,976	290,976
ESG and Climate [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	48,047	46,612
Foreign exchange translation adjustment		1,435
Goodwill, Ending balance	48,047	48,047
All Other - Private Assets [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	21,241	20,586
Acquisitions	670,874
Foreign exchange translation adjustment	(195)	655
Goodwill, Ending balance	$ 691,920	$ 21,241