Stockholders' Equity - Summary of Shares Issued and Held in Treasury or Outstanding (Detail) - shares	Jun. 30, 2024	Dec. 31, 2023
Class A Common Stock [Member]
Class Of Stock [Line Items]
Common stock - issued	20,587,499	20,460,615
Common stock - held in treasury	(5,379,537)	(5,016,964)
Common stock - outstanding	15,207,962	15,443,651
Class B Common Stock [Member]
Class Of Stock [Line Items]
Common stock - issued	234,903	234,903
Common stock - held in treasury	(234,903)	(234,903)