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Summary of Significant Accounting Policies (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 29, 2018 segment | Dec. 31, 2021 USD ($) installment | Dec. 31, 2021 USD ($) segment installment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of reportable segments | segment | 2 |  | 1 |  |
Allowance for doubtful accounts on accrued commissions receivable |  | $ 9,900,000 | $ 9,900,000 | $ 14,000,000 |
Impairment of goodwill |  |  | 0 | 0 | $ 0
Impairment of goodwill or indefinite-lived intangible assets |  |  | $ 0 | $ 0 | $ 0
Number of installment | installment |  | 4 | 4 |  |
Quarterly Percentage to preferred units |  | 0.006875 | 0.006875 |  |
Percentage to preferred units |  |  | 2.75% |  |
Software, including software development costs |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Software amortization period |  |  | 3 years |  |
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted stock saleable period |  |  | 5 years |  |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted stock saleable period |  |  | 10 years |  |
Maximum | Computer and communications equipment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life of computer software |  |  | 5 years |  |

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