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Nature of Business and Summary of Significant Accounting Policies - Summary of Property and Equipment Estimated Useful Lives and Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 187,793	$ 206,606
Less: accumulated depreciation	(123,059)	(136,226)
Property and equipment, net	64,734	70,380
Computer and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 133,346	143,942
Computer and office equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	3 years
Computer and office equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 29,535	33,346
Useful Lives, description	Lesser of useful life of improvement or remaining life of lease
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 14,588	14,553
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	7 years
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	30 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,539	12,980
Useful Lives	7 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,785	$ 1,785
Useful Lives, description	Non-depreciable

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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