Property, Equipment and Software, Net - Narrative (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	[1]	$ 5,575,000	$ 56,526,000	$ 62,151,000
Property, Equipment and Software
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense		38,200,000	45,200,000	51,600,000
Leasehold Improvements And Furniture And Fixtures
Property, Plant and Equipment [Line Items]
Impairment expense		0	1,900,000	0
Internally developed software
Property, Plant and Equipment [Line Items]
Impairment expense		$ 800,000	$ 5,700,000	$ 3,900,000

[1] Prior period amounts have been reclassified to conform to the current period presentation. See “Notes to Consolidated Financial Statements – Note 1. Summary of Significant Accounting Policies” for additional information.