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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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