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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Significant Accounting Policies [Line Items]
Revenues	$ 219,462	$ 197,660	$ 428,038	$ 407,978
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	11,076	10,400	22,164	21,130
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	11,039	10,358	22,089	20,898
Post-trade Services [Member] | Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 37	$ 42	$ 75	$ 232