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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Significant Accounting Policies [Line Items]
Revenues	$ 218,415	$ 219,462	$ 451,795	$ 428,038
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	11,598	11,076	23,205	22,164
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	11,548	11,039	23,091	22,089
Post-trade Services [Member] | Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 50	$ 37	$ 114	$ 75