Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 5,031
Payments received in advance of services to be performed	12,508
Revenue recognized for services performed during the period	(12,251)
Foreign Currency Translation	(24)
Deferred revenues, ending balance	5,264
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,343
Payments received in advance of services to be performed	3,866
Revenue recognized for services performed during the period	(4,197)
Deferred revenues, ending balance	3,012
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	1,376
Payments received in advance of services to be performed	6,596
Revenue recognized for services performed during the period	(5,998)
Foreign Currency Translation	(24)
Deferred revenues, ending balance	1,950
Technology Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	312
Payments received in advance of services to be performed	2,046
Revenue recognized for services performed during the period	(2,056)
Deferred revenues, ending balance	$ 302