Summary of Significant Accounting Policies - Computation of Basic EPS to Dilutive EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net earnings per share, basic, Net Earnings	$ 50,873	$ 60,494	$ 103,441	$ 116,466
Effect of stock options and stock grants, Net Earnings	0	0	0	0
Net earnings per share, diluted, Net Earnings	$ 50,873	$ 60,494	$ 103,441	$ 116,466
Net earnings per share, basic, Weighted Average Shares	142,700,905	142,682,251	142,683,322	142,620,838
Effect of stock options and stock grants, Weighted Average Shares	386,650	556,418	344,181	652,553
Net earnings per share, diluted, Weighted Average Shares	143,087,555	143,238,669	143,027,503	143,273,391
Net earnings per share, basic, Per Share Amount	$ 0.36	$ 0.42	$ 0.72	$ 0.82
Effect of stock options and stock grants, Per Share Amount	0	0	0	(0.01)
Net earnings per share, diluted, Per Share Amount	$ 0.36	$ 0.42	$ 0.72	$ 0.81