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Parent Company Information - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Cash flows from operating activities |  |  |
Net Income (Loss) | $ 246,627 | $ 274,181 | $ 258,055
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 76,699 | 73,824 | 70,557
Amortization of operating lease right-of-use assets | 7,523 | 6,639 | 5,853
Stock-based compensation expense | 30,918 | 29,684 | 29,190
Deferred taxes | 22,019 | (3,878) | (5,815)
Other | (1,620) | 7,042 | (3,113)
Changes in operating assets and liabilities: |  |  |
(Increase)/decrease in accounts receivable | (2,380) | (3,730) | (7,116)
Decrease in prepaid expenses and other assets | 819 | 1,009 | (11,898)
(Decrease) increase in accrued employee compensation | 3,195 | 7,049 | 1,466
Increase (decrease) in income and other tax liabilities | 23,510 | (3,284) | (14,691)
(Decrease)/increase in accounts payable, accrued expenses and other liabilities | 4,000 | 3,543 | (7,229)
(Decrease) in operating lease liabilities | (9,019) | (8,730) | (6,735)
Net cash provided by operating activities | 382,139 | 385,237 | 333,767
Cash flows from investing activities |  |  |
Acquisition of business | (36,515) | 0 | (78,476)
Proceeds from maturities and sales | 10,570 | 12,440 | 4,452
Purchases | (12,968) | (42,810) | (28,818)
Purchases of furniture, equipment and leasehold improvements | (8,204) | (9,942) | (9,326)
Net cash (used in) investing activities | (96,927) | (86,935) | (155,290)
Cash flows from financing activities |  |  |
Cash dividends on common stock | (115,199) | (112,697) | (109,658)
Exercise of stock options | 0 | 2,988 | 940
Withholding tax payments on Full Value Awards vesting and stock option exercises | (17,155) | (16,194) | (25,839)
Repurchases of common stock | (420,015) | (75,474) | 0
Net cash (used in) financing activities | (332,369) | (201,377) | (147,057)
Effect of exchange rate changes on cash and cash equivalents | 22,549 | (8,138) | 7,588
Cash and cash equivalents including restricted cash |  |  |
Net increase/(decrease) for the period | (24,608) | 88,787 | 39,008
Beginning of period | 700,459 | 611,672 | 572,664
End of period | 675,851 | 700,459 | 611,672
Supplemental cash flow information: |  |  |
Cash paid for income taxes | 62,834 | 96,932 | 94,814
Cash paid for interest | 721 | 1,717 | 1,870
Non-cash investing and financing activity |  |  |
Excise tax on repurchases of common stock | 3,361 | 0 | 0
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | 783 | 1,840 | 1,183
Treasury stock used for acquisition of business | 0 | 0 | (43,841)
MarketAxess Holdings Inc. (Parent) [Member] |  |  |
Cash flows from operating activities |  |  |
Net Income (Loss) | 246,912 | 274,181 | 258,055
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 2,200 | 2,186 | 2,153
Amortization of operating lease right-of-use assets | 3,986 | 3,697 | 3,361
Stock-based compensation expense | 7,042 | 7,130 | 9,725
Deferred taxes | (625) | 397 | 101
Equity in undistributed income of subsidiaries | (284) | (42,362) | (2,221)
Other | (550) | 4,304 | (4,675)
Changes in operating assets and liabilities: |  |  |
(Increase)/decrease in accounts receivable | 130 | 526 | (1,154)
Decrease in receivable from subsidiaries | 26,332 | 12,694 | 5,474
Decrease in prepaid expenses and other assets | 2,057 | 304 | 1,296
(Decrease) increase in accrued employee compensation | (529) | 1,118 | (1,104)
(Increase) decrease in income and other tax receivables | (1,526) | (579) | 3,800
Increase (decrease) in income and other tax liabilities | (941) | (2,278) | 2,287
(Decrease)/increase in accounts payable, accrued expenses and other liabilities | 8,495 | 4,809 | (861)
(Decrease) in operating lease liabilities | (5,015) | (4,669) | (3,624)
Net cash provided by operating activities | 287,452 | 261,364 | 272,424
Cash flows from investing activities |  |  |
Acquisition of business | (38,069) | 0 | (81,161)
Investments in subsidiaries | (700) | (30) | (10,058)
Proceeds from maturities and sales | 10,570 | 12,440 | 4,454
Purchases | (12,968) | (42,810) | (28,818)
Purchases of furniture, equipment and leasehold improvements | (44) | (156) | (239)
Net cash (used in) investing activities | (41,211) | (30,556) | (115,822)
Cash flows from financing activities |  |  |
Cash dividends on common stock | (115,199) | (112,697) | (109,658)
Exercise of stock options | 0 | 2,988 | 940
Withholding tax payments on Full Value Awards vesting and stock option exercises | (17,155) | (16,194) | (25,839)
Repurchases of common stock | (420,015) | (75,474) | 0
Proceeds from borrowings | 220,000 | 100,000 | 100,000
Repayments of borrowings | 0 | (100,000) | (100,000)
Net cash (used in) financing activities | (332,369) | (201,377) | (134,557)
Effect of exchange rate changes on cash and cash equivalents | 0 | 0 | (3)
Cash and cash equivalents including restricted cash |  |  |
Net increase/(decrease) for the period | (86,128) | 29,431 | 22,042
Beginning of period | 95,382 | 65,951 | 43,909
End of period | 9,254 | 95,382 | 65,951
Supplemental cash flow information: |  |  |
Cash paid for income taxes | 44,179 | 53,999 | 55,784
Cash paid for interest | 0 | 167 | 35
Non-cash investing and financing activity |  |  |
Exercise of stock options - cashless | 0 | 1,735 | 0
Excise tax on repurchases of common stock | 3,361 | 0 | 0
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | 0 | 0 | 1,072
Treasury stock used for acquisition of business | 0 | 0 | 43,841
Mutual Funds Held In Rabbi Trust [Member] |  |  |
Changes in operating assets and liabilities: |  |  |
(Increase)/decrease in trading investments | (359) | (621) | (1,103)
Mutual Funds Held In Rabbi Trust [Member] | MarketAxess Holdings Inc. (Parent) [Member] |  |  |
Changes in operating assets and liabilities: |  |  |
(Increase)/decrease in trading investments | (232) | (94) | (189)
Trading Investments [Member] |  |  |
Changes in operating assets and liabilities: |  |  |
(Increase)/decrease in trading investments | $ 206 | $ (629) | $ (25,248)

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