Calculation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share		$ 0.78	$ 0.53	$ 3.67	$ 3.48
Calculation of Basic Earnings Per Share:
Net Income		$ 17,507	$ 9,407	$ 81,946	$ 61,884
Weighted shares outstanding (shares)	[1]	22,501,000	17,797,000	22,346,000	17,784,000
Basic Earnings Per Share (in dollars per share)		$ 0.78	$ 0.53	$ 3.67	$ 3.48
Reconciliation of Numerator:
Net Income		$ 17,507	$ 9,407	$ 81,946	$ 61,884
Reconciliation of Denominator:
Weighted shares outstanding - Basic (shares)	[1]	22,501,000	17,797,000	22,346,000	17,784,000
Effect of dilutive securities:
Share-based compensation (shares)		63,000	61,000	56,000	63,000
Adjusted denominator-Diluted (shares)		22,564,000	17,858,000	22,402,000	17,847,000
Income (Loss) from Continuing Operations, Per Diluted Share		$ 0.78	$ 0.53	$ 3.66	$ 3.47
Diluted Earnings Per Share (in dollars per share)		$ 0.78	$ 0.53	$ 3.66	$ 3.47
Net Income		$ 17,507	$ 9,407	$ 81,946	$ 61,884
Basic (shares)	[1]	22,501,000	17,797,000	22,346,000	17,784,000
Income (Loss) from Continuing Operations, Per Basic Share		$ 0.78	$ 0.53	$ 3.67	$ 3.48
Basic (in dollars per share)		$ 0.78	$ 0.53	$ 3.67	$ 3.48
Share-based compensation (shares)		63,000	61,000	56,000	63,000
Diluted (shares)		22,564,000	17,858,000	22,402,000	17,847,000
Income (Loss) from Continuing Operations, Per Diluted Share		$ 0.78	$ 0.53	$ 3.66	$ 3.47
Diluted (in dollars per share)		$ 0.78	$ 0.53	$ 3.66	$ 3.47
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		$ 17,507	$ 9,407	81,946	$ 61,884
Calculation of Basic Earnings Per Share:
Net Income		17,507	9,407	81,946	61,884
Reconciliation of Numerator:
Net Income		17,507	9,407	81,946	61,884
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		17,507	9,407	81,946	61,884
Net Income		$ 17,507	$ 9,407	$ 81,946	$ 61,884

[1]  (1) Weighted average shares for the three and nine months ended September 30, 2024 reflect the impact of 4.4 million common shares issued in November 2023 in connection with the acquisition of FCG. See Notes 3 and 9 for additional details on the acquisition and related equity offering.