Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2025	Jun. 30, 2025
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 5,003	$ 5,003
Payments received in advance of services to be performed	24,331
Revenue recognized for services performed during the period	(26,130)
Foreign Currency Translation	118
Deferred revenues, ending balance		3,322
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,302	3,302
Payments received in advance of services to be performed		7,045
Revenue recognized for services performed during the period		(7,343)
Deferred revenues, ending balance		3,004
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	1,286	1,286
Payments received in advance of services to be performed		13,349
Revenue recognized for services performed during the period		(14,753)
Foreign Currency Translation		118
Deferred revenues, ending balance		0
Technology Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 415	415
Payments received in advance of services to be performed		3,937
Revenue recognized for services performed during the period		(4,034)
Deferred revenues, ending balance		$ 318