Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Customers	Dec. 31, 2022 USD ($) Customers	Dec. 31, 2021 USD ($) Customers
Significant Accounting Policies [Line Items]
Deferred revenue	$ 1,900	$ 1,900
Uncollectible accounts	900
Contract with customer, liability, revenue recognized	1,300
Advertising expenses	187,600	275,900	$ 289,000
Allowance for doubtful accounts		700
Asset impairment charges	$ 0	$ 0	$ 0
Common stock, conversion features	Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time.
Expected period of benefit of sales commissions, description	one year or less
Maximum [Member]
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts	$ 100
Software [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Number of major customers | Customers	1	2	1
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer A [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	18.00%	21.00%	16.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer B [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage		11.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Number of major customers | Customers	1	1
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer A [Member]
Significant Accounting Policies [Line Items]
Concentration risk percentage	42.00%	23.00%
Commission Fees [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Revenue percentage	10.00%