Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill		$ 710,129
Accumulated impairment		(142,983)
Goodwill [Roll Forward]
Goodwill, net beginning balance	$ 567,146
Goodwill recorded in connection with business acquisitions	240,487
Foreign currency translation	(832)
Goodwill, net ending balance	806,801
Huron Healthcare
Goodwill [Line Items]
Goodwill		377,588
Goodwill [Roll Forward]
Goodwill, net beginning balance	377,588
Goodwill recorded in connection with business acquisitions	232,676
Goodwill, net ending balance	610,264
Huron Education and Life Sciences
Goodwill [Line Items]
Goodwill		102,906
Goodwill [Roll Forward]
Goodwill, net beginning balance	102,906
Goodwill, net ending balance	102,906
Huron Legal
Goodwill [Line Items]
Goodwill		52,555
Goodwill [Roll Forward]
Goodwill, net beginning balance	52,555
Goodwill recorded in connection with business acquisitions	7,363
Foreign currency translation	(219)
Goodwill, net ending balance	59,699
Huron Business Advisory
Goodwill [Line Items]
Goodwill		177,080
Accumulated impairment		$ (142,983)
Goodwill [Roll Forward]
Goodwill, net beginning balance	34,097
Goodwill recorded in connection with business acquisitions	448
Foreign currency translation	(613)
Goodwill, net ending balance	$ 33,932