Significant Accounting Policies - Summary of Post-Trade Services Revenue by Timing of Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Significant Accounting Policies [Line Items]
Revenues	$ 208,576	$ 210,318
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	11,088	10,730
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	11,049	10,540
Post-trade Services [Member] | Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 39	$ 190