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Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment
Fixed assets, gross	$ 209,979	$ 183,524
Accumulated depreciation and amortization	(96,631)	(87,157)
Fixed assets, net	113,348	96,367
Leasehold improvements, furniture and fixtures, and other fixed assets
Property, Plant and Equipment
Fixed assets, gross	151,267	126,428
Software, including software development costs
Property, Plant and Equipment
Fixed assets, gross	32,019	30,928
Computer and communications equipment
Property, Plant and Equipment
Fixed assets, gross	$ 26,693	$ 26,168

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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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