Significant Accounting Policies - Summary of Post-Trade Services Revenue by Timing of Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Significant Accounting Policies [Line Items]
Revenues	$ 197,660	$ 179,846	$ 407,978	$ 383,015
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	10,400	9,415	21,130	19,395
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	10,358	9,397	20,898	19,352
Post-trade Services [Member] | Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 42	$ 18	$ 232	$ 43