Significant Accounting Policies - Summary of Post-Trade Services Revenue by Timing of Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Significant Accounting Policies [Line Items]
Revenues	$ 210,318	$ 203,169
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	10,730	9,980
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	10,540	9,955
Post-trade Services [Member] | Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 190	$ 25