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Fixed Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 84,115 | $ 79,466 | $ 71,495
Impairment charges | 7,000 | 4,500 | 1,100
Leasehold Improvements and Other Fixed Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset retirement obligations | 5,900 | 6,400 |
Occupancy and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 24,100 | 21,500 | 19,500
Software development costs capitalized | 54,000 | 48,800 | 49,900
Amortization of software development costs | $ 31,800 | $ 28,600 | $ 24,700

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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