Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 4,539
Payments received in advance of services to be performed	11,949
Revenue recognized for services performed during the period	(11,141)
Foreign Currency Translation	(7)
Deferred revenues, ending balance	5,340
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,049
Payments received in advance of services to be performed	3,437
Revenue recognized for services performed during the period	(3,544)
Deferred revenues, ending balance	2,942
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	923
Payments received in advance of services to be performed	6,498
Revenue recognized for services performed during the period	(5,487)
Foreign Currency Translation	(7)
Deferred revenues, ending balance	1,927
Technology Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	567
Payments received in advance of services to be performed	2,014
Revenue recognized for services performed during the period	(2,110)
Deferred revenues, ending balance	$ 471