Introduction and Basis of Presentation - Additional Information (Detail) - Sales Revenue, Services, Net [Member] - Customer Concentration Risk [Member] - Customer	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Introduction And Basis Of Presentation [Line Items]
Number of major customers accounted for 10.0% or more of revenues	1	1
Blackrock Inc [Member]
Introduction And Basis Of Presentation [Line Items]
Percentage of operating revenues accounted for by major customer	10.90%	12.00%
Index [Member] \| Blackrock Inc [Member]
Introduction And Basis Of Presentation [Line Items]
Percentage of operating revenues accounted for by major customer	18.00%	19.20%
Analytics [Member]
Introduction And Basis Of Presentation [Line Items]
Number of major customers accounted for 10.0% or more of revenues	0	0
ESG and Climate [Member]
Introduction And Basis Of Presentation [Line Items]
Number of major customers accounted for 10.0% or more of revenues	0	0
All Other - Private Assets [Member]
Introduction And Basis Of Presentation [Line Items]
Number of major customers accounted for 10.0% or more of revenues	0	0

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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