Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 4,539
Payments received in advance of services to be performed	22,930
Revenue recognized for services performed during the period	(22,295)
Foreign Currency Translation	(6)
Deferred revenues, ending balance	5,168
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,049
Payments received in advance of services to be performed	7,158
Revenue recognized for services performed during the period	(7,176)
Deferred revenues, ending balance	3,031
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	923
Payments received in advance of services to be performed	11,671
Revenue recognized for services performed during the period	(10,871)
Foreign Currency Translation	(6)
Deferred revenues, ending balance	1,717
Technology Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	567
Payments received in advance of services to be performed	4,101
Revenue recognized for services performed during the period	(4,248)
Deferred revenues, ending balance	$ 420