Equity Incentive Plans - Schedule of Time-Vested Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Jun. 24, 2025	Mar. 17, 2025	Mar. 01, 2025	Dec. 31, 2025	Dec. 31, 2024
Time Vested Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number				0	25,000
Exercisable, weighted average exercise price (in USD per share)				$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 2.6
Exercise of stock options, shares				(25,000)
Aggregate intrinsic value, options exercisable, ending balance				$ 0.0
Exercisable, shares, ending balance				0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price				$ 0	$ 52.49
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price				$ 52.49
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term (years), option outstanding					3 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 0.0	$ 1.8
Performance-based stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number				95,000	164,000
Exercisable, weighted average exercise price (in USD per share)				$ 60.94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				24,000
Exercise of stock options, shares				(60,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period				(33,000)
Weighted-average remaining contractual term (years), options exercisable				3 years 7 months 6 days
Aggregate intrinsic value, options exercisable, ending balance				$ 5.2
Exercisable, shares, ending balance				47,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price				$ 88.26	$ 72.44
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price				62.97
Nonvested And Unearned Performance Shares				$ 101.65
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term (years), option outstanding				4 years 4 months 24 days	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 8.0	$ 8.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 4.9
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	4.40%	4.20%	4.00%

Huron Consulting Group Inc. 10-K