Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 5,003
Revenue billed in advance of services to be performed	43,007
Revenue recognized for services performed during the period	(43,070)
Foreign Currency Translation	91
Deferred revenues, ending balance	5,031
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,302
Revenue billed in advance of services to be performed	15,512
Revenue recognized for services performed during the period	(15,471)
Deferred revenues, ending balance	3,343
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	1,286
Revenue billed in advance of services to be performed	21,552
Revenue recognized for services performed during the period	(21,553)
Foreign Currency Translation	91
Deferred revenues, ending balance	1,376
Technology Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	415
Revenue billed in advance of services to be performed	5,943
Revenue recognized for services performed during the period	(6,046)
Deferred revenues, ending balance	$ 312