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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]  
Schedule of Employee Deferred Compensation Plans
The following table presents the Company’s income from investments held in employee deferred compensation trusts (in thousands):
Year Ended December 31,
202520242023
Dividend income$(27,221)$(22,423)$(15,049)
Realized and unrealized gains(78,871)(71,656)(72,971)
Income from investments held in employee deferred compensation trusts (which is completely offset by related costs and expenses)$(106,092)$(94,079)$(88,020)
The following table presents the Company’s increase in employee deferred compensation costs and expense related to changes in the fair value of trust assets for its nonqualified employee deferred compensation plans (in thousands):
Year Ended December 31,
202520242023
Increase in employee deferred compensation costs and expense related to changes in the fair value of trust assets$106,092 $94,079 $88,020 
Schedule of Allocation of Plan Assets
The following table summarizes the Company’s financial instruments by significant category and fair value measurement on a recurring basis (in thousands):
Fair Value Measurements Using
Balance at December 31, 2025Quoted Prices
in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
Cash equivalents
Money market funds$276,809 $276,809 — — 
Employee deferred compensation trust assets
Money market funds$141,760 $141,760 — — 
Mutual funds - bonds44,496 44,496 — — 
Mutual funds - stocks453,065 453,065 — — 
Mutual funds - blend134,617 134,617 — — 
Total employee deferred compensation trust assets$773,938 $773,938 — — 
Fair Value Measurements Using
Balance at December 31, 2024Quoted Prices
in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
Cash equivalents
Money market funds$293,990 $293,990 — — 
Employee deferred compensation trust assets
Money market funds$125,112 $125,112 — — 
Mutual funds - bonds38,705 38,705 — — 
Mutual funds - stocks401,751 401,751 — — 
Mutual funds - blend107,672 107,672 — — 
Total employee deferred compensation trust assets$673,240 $673,240 — — 
Schedule of Accounts Receivable, Allowance for Credit Loss
The following table sets forth the activity in the allowance for credit losses from December 31, 2023, through December 31, 2025 (in thousands):
Allowance for Credit Losses
Balance as of December 31, 2023
$25,189 
Charges to expense5,286 
Deductions(8,009)
Other, including translation adjustments(505)
Balance as of December 31, 2024
$21,961 
Charges to expense3,151 
Deductions(6,972)
Other, including translation adjustments1,275 
Balance as of December 31, 2025
$19,415 
Schedule of Depreciation Expense Computed Using Straight-Line Method over Useful Lives Depreciation is computed using the straight-line method over the following useful lives:
Computer hardware
2 to 3 years
Computer software
2 to 5 years
Furniture and equipment
3 to 5 years
Leasehold improvementsTerm of lease
Property and equipment consisted of the following (in thousands):
 December 31,
 20252024
Computer hardware$107,138 $131,059 
Computer software229,595 224,609 
Furniture and equipment95,028 96,288 
Leasehold improvements205,603 200,565 
Property and equipment, cost637,364 652,521 
Accumulated depreciation(508,550)(532,957)
Property and equipment, net$128,814 $119,564