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Fixed Assets, Net - Components of Fixed Assets, Net (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment |  |
Fixed assets, gross | $ 206,796 | $ 183,524
Accumulated depreciation and amortization | (91,344) | (87,157)
Fixed assets, net | 115,452 | 96,367
Leasehold improvements, furniture and fixtures, and other fixed assets |  |
Property, Plant and Equipment |  |
Fixed assets, gross | 148,709 | 126,428
Software, including software development costs |  |
Property, Plant and Equipment |  |
Fixed assets, gross | 31,691 | 30,928
Computer and communications equipment |  |
Property, Plant and Equipment |  |
Fixed assets, gross | $ 26,396 | $ 26,168

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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