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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:      
Net income $ 377,678 $ 454,533 $ 417,083
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 124,811 89,559 91,800
Operating lease right-of-use assets amortization expense 41,270 37,545 40,902
Bad debt expense (recovery) 1,814 (4,402) 4,047
Deferred taxes (59,297) (64,195) (37,194)
Stock-based compensation expense 176,764 167,297 147,730
Unrealized gain on derivative instruments 0 0 (7,904)
Impairment charges 175 417 6,019
Loss on sale of business 0 0 25,922
Other 10,858 5,727 (599)
Changes in assets and liabilities:      
Trade receivables and contract assets (69,129) 15,588 32,356
Prepaid and other assets (14,844) (76,959) 8,409
Accounts payable (12,683) (29,084) 154
Accrued expenses and other liabilities 144,128 10,673 (84,610)
Operating lease liabilities (46,248) (39,365) (48,093)
Income taxes payable (20,363) (8,166) (33,388)
Net cash provided by operating activities 654,934 559,168 562,634
Cash flows from investing activities:      
Purchases of property and equipment (42,243) (32,146) (28,415)
Purchases of short-term investments (2,057) (1,229) (11,169)
Proceeds from short-term investments 0 61,509 10,865
Acquisition of businesses, net of cash acquired (Note 3) (3,432) (912,158) (24,817)
Purchases of non-marketable securities (1,025) (7,612) (3,296)
Proceeds from sale of non-marketable securities 3,051 4,344 0
Other investing activities, net (3,341) 2,312 (9,936)
Net cash used in investing activities (49,047) (884,980) (66,768)
Cash flows from financing activities:      
Proceeds from issuance of stock under employee incentive programs 54,578 53,731 51,636
Payments of withholding taxes related to net share settlements of equity awards (26,802) (35,190) (29,102)
Proceeds from debt 5,714 8 825
Repayment of debt (8,260) (1,865) (2,969)
Repurchase of common stock (662,159) (398,028) (164,924)
Payment of contingent consideration for previously acquired businesses (6,244) (6,246) (10,235)
Purchase of subsidiary shares from noncontrolling interest (1,358) 0 0
Other financing activities, net (6,669) (2,817) (11,004)
Net cash used in financing activities (651,200) (390,407) (165,773)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 56,298 (36,497) 29,379
Net increase (decrease) in cash, cash equivalents and restricted cash 10,985 (752,716) 359,472
Cash, cash equivalents and restricted cash, beginning of period 1,290,392 2,043,108 1,683,636
Cash, cash equivalents and restricted cash, end of period 1,301,377 1,290,392 2,043,108
Cash paid during the year for:      
Interest 1,397 3,738 4,698
Supplemental disclosure of non-cash investing and financing activities:      
Acquisition-date fair value of contingent consideration issued for acquisition of businesses 935 9,755 14,850
Capital expenditures incurred but not yet paid $ 4,838 $ 4,190 $ 23,986