Significant Accounting Policies - Summary of Post-Trade Services Revenue by Timing of Recognition (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Significant Accounting Policies [Line Items]
Revenues	$ 846,268	$ 817,097	$ 752,547
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	44,491	42,487	40,178
Post-trade Services [Member] | Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	44,319	42,170	40,061
Post-trade Services [Member] | Transferred at Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 172	$ 317	$ 117