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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Significant Accounting Policies [Line Items]
Revenues	$ 206,715	$ 172,284	$ 614,693	$ 555,299
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	10,382	9,833	31,512	29,228
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	10,333	9,774	31,231	29,126
Post-trade Services [Member] | Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 49	$ 59	$ 281	$ 102