Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 5,003
Payments received in advance of services to be performed	34,652
Revenue recognized for services performed during the period	(34,910)
Foreign Currency Translation	93
Deferred revenues, ending balance	4,838
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,302
Payments received in advance of services to be performed	11,438
Revenue recognized for services performed during the period	(11,646)
Deferred revenues, ending balance	3,094
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	1,286
Payments received in advance of services to be performed	17,261
Revenue recognized for services performed during the period	(17,218)
Foreign Currency Translation	93
Deferred revenues, ending balance	1,422
Technology Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	415
Payments received in advance of services to be performed	5,953
Revenue recognized for services performed during the period	(6,046)
Deferred revenues, ending balance	$ 322