Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 4,248
Payments received in advance of services to be performed	7,330
Revenue recognized for services performed during the period	(6,706)
Foreign Currency Translation	(20)
Deferred revenues, ending balance	4,852
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,528
Payments received in advance of services to be performed	2,457
Revenue recognized for services performed during the period	(2,710)
Deferred revenues, ending balance	3,275
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	720
Payments received in advance of services to be performed	4,873
Revenue recognized for services performed during the period	(3,996)
Foreign Currency Translation	(20)
Deferred revenues, ending balance	$ 1,577