Significant Accounting Policies - Summary of Post-Trade Services Revenue by Timing of Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Significant Accounting Policies [Line Items]
Revenues	$ 233,380	$ 208,576
Post-trade Services [Member]
Significant Accounting Policies [Line Items]
Revenues	11,607	11,088
Post-trade Services [Member] \| Transferred over Time [Member]
Significant Accounting Policies [Line Items]
Revenues	11,543	11,049
Post-trade Services [Member] \| Transferred at a Point in Time [Member]
Significant Accounting Policies [Line Items]
Revenues	$ 64	$ 39

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details