Significant Accounting Policies - Summary of Post-Trade Services Revenue by Timing of Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Significant Accounting Policies [Line Items]
Revenues	$ 208,821	$ 206,715	$ 636,859	$ 614,693
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	11,293	10,382	33,457	31,512
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	11,271	10,333	33,360	31,231
Post-trade Services [Member] | Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 22	$ 49	$ 97	$ 281