Summary of Significant Accounting Policies - Computation of Basic EPS to Dilutive EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net earnings per share, basic, Net Earnings	$ 59,341	$ 58,928	$ 175,807	$ 172,225
Effect of stock options and stock grants, Net Earnings	0	0	0	0
Net earnings per share, diluted, Net Earnings	$ 59,341	$ 58,928	$ 175,807	$ 172,225
Net earnings per share, basic, Weighted Average Shares	142,524,500	142,334,449	142,588,373	142,242,783
Effect of stock options and stock grants, Weighted Average Shares	601,588	884,471	658,395	941,009
Net earnings per share, diluted, Weighted Average Shares	143,126,088	143,218,920	143,246,768	143,183,792
Net earnings per share, basic, Per Share Amount	$ 0.42	$ 0.41	$ 1.23	$ 1.21
Effect of stock options and stock grants, Per Share Amount	(0.01)	0	0	(0.01)
Net earnings per share, diluted, Per Share Amount	$ 0.41	$ 0.41	$ 1.23	$ 1.20