Fair Value of Financial Instruments - Estimated Incremental Borrowing Rates for Similar Types of Borrowing Arrangements (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Level 3 [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Manufacturer flooring plans payable fair value	$ 2,642	$ 2,708
Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Manufacturer flooring plans payable fair value	2,224	2,490
Level 2 [Member] | Carrying Amount [Member] | Senior Unsecured Notes Due 2028 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Unsecured Notes due 2028 with interest computed at 3.875% (Level 2)	1,243,573	1,242,852
Level 2 [Member] | Fair Value [Member] | Senior Unsecured Notes Due 2028 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Unsecured Notes due 2028 with interest computed at 3.875% (Level 2)	$ 1,128,213	$ 1,137,170