Restructuring and Other Related Charges - Narrative (Detail) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) employee	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Restructuring Plan
Restructuring and other related charges	$ 6,524		$ 6,481	$ 13,076	$ 11,828
Contract termination fees	4,510			4,510		$ 3,596
Impairments of property and equipment, net				2,640	0
Payments				8,853
Capitalized software
Restructuring Plan
Impairments of property and equipment, net		$ 1,400
Employee Costs
Restructuring Plan
Severance-related costs	5,100			$ 8,200
Number of employees eliminated | employee				240
Restructuring liability, current	2,300			$ 2,300
Restructuring liability, noncurrent	500			500
Contract termination fees	2,820			2,820		3,596
Payments				8,853
Real Estate Rationalization
Restructuring Plan
Restructuring liability, current	1,000			1,000
Restructuring liability, noncurrent	700			700
Contract termination fees	1,690			1,690		$ 0
Payments				0
Real Estate Rationalization | Chicago Office
Restructuring Plan
Contract termination fees	1,400			1,400
Gain (loss) on rent concession and tenant improvement allowances				300
Impairments of property and equipment, net				700
Real Estate Rationalization | Brussels Office
Restructuring Plan
Contract termination fees	300			300
Gain (loss) on rent concession and tenant improvement allowances	(600)			(600)
Impairments of property and equipment, net	600
Vendor Rationalization
Restructuring Plan
Payments	500			700
Plan
Restructuring Plan
Restructuring and other related charges	$ 6,500		$ 6,500	$ 13,100	$ 11,800