Significant Accounting Policies - Summary of Revenue Recognized from Contract Liabilities and Remaining Balance (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	$ 4,248
Payments received in advance of services to be performed	26,145
Revenue recognized for services performed during the period	(26,133)
Foreign Currency Translation	(12)
Deferred revenues, ending balance	4,248
Information Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	3,203
Payments received in advance of services to be performed	10,657
Revenue recognized for services performed during the period	(10,332)
Deferred revenues, ending balance	3,528
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenues, beginning balance	1,045
Payments received in advance of services to be performed	15,488
Revenue recognized for services performed during the period	(15,801)
Foreign Currency Translation	(12)
Deferred revenues, ending balance	$ 720