Stockholders' Equity - Narrative (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 25, 2024	Jul. 06, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jun. 30, 2024	Mar. 01, 2024	Jun. 30, 2023	May 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Preferred stock, authorized (in shares)			50,000,000		50,000,000
Preferred stock, par value (in dollars per share)			$ 0.001		$ 0.001
Common stock, par value (in dollars per share)			$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001					$ 0.001
Preferred stock, issued (in shares)			0		0
Payments for repurchase of common stock					$ 9,603,000	$ 31,241,000
Class A Stock
Class of Stock [Line Items]
Common stock, authorized (in shares)			50,000,000		50,000,000		50,000,000
Common stock, par value (in dollars per share)			$ 0.001		$ 0.001
Common stock, issued (in shares)			10,231,736		10,231,736		10,186,783
Common stock, outstanding (in shares)		10,447,392	10,231,736	10,289,233	10,231,736	10,289,233	10,186,783	10,227,845	10,357,376	10,884,575		10,868,556
Total consideration for repurchase of stock			$ 294,862	$ 6,500,000	$ 9,600,000	$ 13,800,000
Remaining amount authorized for repurchase (in shares)			497,893		497,893		223,699		638,155
Class A Stock | Subsequent Event
Class of Stock [Line Items]
Quarterly dividend payable amount per share (in dollars per share)	$ 0.18
Class A Stock | Modified Dutch Auction Tender Offer
Class of Stock [Line Items]
Authorized amount											$ 30,000,000
Stock repurchase program, price (in dollars per share)		$ 40.00
Stock repurchased (in shares)		437,183
Payments for repurchase of common stock		$ 17,490,000
Class A Stock | Modified Dutch Auction Tender Offer | Minimum
Class of Stock [Line Items]
Stock repurchase program, price (in dollars per share)											$ 34.00
Class A Stock | Modified Dutch Auction Tender Offer | Maximum
Class of Stock [Line Items]
Stock repurchase program, price (in dollars per share)											$ 40.00
Class A Stock | New Program
Class of Stock [Line Items]
Stock repurchased (in shares)			5,981	168,904	243,806	360,094	463,335
Total consideration for repurchase of stock							$ 17,600,000
Stock repurchased (in dollars per share)			$ 49.30	$ 38.30	$ 39.39	$ 38.20	$ 38.07
Class A Stock | Previous Program
Class of Stock [Line Items]
Remaining amount authorized for repurchase (in shares)									120,155
Class A Stock | Share Repurchase Program, March (2024)
Class of Stock [Line Items]
Repurchase of class A common stock (in shares)									518,000
Shares repurchased as a percent of shares outstanding (as a percent)									5.00%
Class B Stock
Class of Stock [Line Items]
Common stock, authorized (in shares)			99,665		99,665		99,665
Common stock, par value (in dollars per share)			$ 0.001		$ 0.001
Common stock, issued (in shares)			99,665		99,665		99,665
Common stock, outstanding (in shares)			99,665		99,665		99,665
Class B Stock | Subsequent Event
Class of Stock [Line Items]
Quarterly dividend payable amount per share (in dollars per share)	$ 0.18