Capital Stock - Narrative (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Capital Unit [Line Items]
Preferred stock, par value (in dollars per share)	$ 50,000	$ 50,000
Cumulative preferred nonvoting stock (as a percent)	4.50%	4.50%
Treasury shares, at cost	$ 398,204	$ 363,284
Common stock, shares authorized (in shares)	180,000,000	180,000,000
Common stock, par value (in dollars per share)	$ 0
Common stock, shares issued (in shares)	62,081,391	62,081,391
Common stock, shares, outstanding (in shares)	39,260,080	39,317,212
Treasury Stock, Common, Shares	22,821,311	22,764,179
Cumulative preferred stock
Capital Unit [Line Items]
Preferred stock, shares authorized (in shares)	100,000
Preferred stock, par value (in dollars per share)	$ 50
Cumulative preferred nonvoting stock (as a percent)	4.50%
Preferred stock, callable price per share (in dollars per share)	$ 52.50
Preferred stock, shares issued (in shares)	71,340	71,340
Purchase of treasury shares (in shares)	0
Treasury Stock, Preferred, Shares	52,998	52,998
Second cumulative preferred voting stock
Capital Unit [Line Items]
Preferred stock, shares authorized (in shares)	1,000,000
Preferred stock, par value (in dollars per share)	$ 10
Preferred stock, shares issued (in shares)	0	0
Common stock
Capital Unit [Line Items]
Purchase of treasury shares (in shares)	166,292	0	251,408
Common stock, shares issued (in shares)	62,081,391	62,081,391
Common stock, value, issued (up to)	$ 200,000
Treasury Stock, Common
Capital Unit [Line Items]
Reissued shares (in shares)	149,179	132,797
Preferred stock
Capital Unit [Line Items]
Treasury shares, at cost	$ 1,800