Calculation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 2.07	$ 2.05
Calculation of Basic Earnings Per Share:
Net Income	$ 46,168	$ 36,344
Weighted shares outstanding (shares)	22,250,000	17,760,000
Basic Earnings Per Share (in dollars per share)	$ 2.07	$ 2.05
Reconciliation of Numerator:
Net Income	$ 46,168	$ 36,344
Reconciliation of Denominator:
Weighted shares outstanding - Basic (shares)	22,250,000	17,760,000
Effect of dilutive securities:
Share-based compensation (shares)	56,000	72,000
Adjusted denominator-Diluted (shares)	22,306,000	17,832,000
Income (Loss) from Continuing Operations, Per Diluted Share	$ 2.07	$ 2.04
Diluted Earnings Per Share (in dollars per share)	$ 2.07	$ 2.04
Net Income	$ 46,168	$ 36,344
Basic (shares)	22,250,000	17,760,000
Income (Loss) from Continuing Operations, Per Basic Share	$ 2.07	$ 2.05
Basic (in dollars per share)	$ 2.07	$ 2.05
Share-based compensation (shares)	56,000	72,000
Diluted (shares)	22,306,000	17,832,000
Income (Loss) from Continuing Operations, Per Diluted Share	$ 2.07	$ 2.04
Diluted (in dollars per share)	$ 2.07	$ 2.04
Proceeds from Issuance of Senior Long-Term Debt	$ 550,000
Retained Earnings [Member]
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	46,168	$ 36,344
Calculation of Basic Earnings Per Share:
Net Income	46,168	36,344
Reconciliation of Numerator:
Net Income	46,168	36,344
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	46,168	36,344
Net Income	$ 46,168	$ 36,344