Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 4,539
Payments received in advance of services to be performed	35,216
Revenue recognized for services performed during the period	(34,691)
Foreign Currency Translation	48
Deferred revenues, ending balance	5,112
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,049
Payments received in advance of services to be performed	10,900
Revenue recognized for services performed during the period	(10,843)
Deferred revenues, ending balance	3,106
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	923
Payments received in advance of services to be performed	18,131
Revenue recognized for services performed during the period	(17,516)
Foreign Currency Translation	48
Deferred revenues, ending balance	1,586
Technology Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	567
Payments received in advance of services to be performed	6,185
Revenue recognized for services performed during the period	(6,332)
Deferred revenues, ending balance	$ 420