Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 3,990
Payments received in advance of services to be performed	26,415
Revenue recognized for services performed during the period	(26,670)
Foreign Currency Translation	(6)
Deferred revenues, ending balance	3,741
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,121
Payments received in advance of services to be performed	9,042
Revenue recognized for services performed during the period	(9,329)
Deferred revenues, ending balance	2,834
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	869
Payments received in advance of services to be performed	17,373
Revenue recognized for services performed during the period	(17,341)
Foreign Currency Translation	(6)
Deferred revenues, ending balance	$ 907