Earnings Per Share - Summary of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 271,496	$ 239,702	$ 214,835	$ 454,537	$ 726,033	$ 981,890	$ 954,327	$ 839,497
Denominator for basic earnings per share (in shares)	73,165	73,887	73,521	73,705	73,523	73,155	75,598	82,060
Dilutive securities (in shares)						1,232	1,264	2,001
Denominator for diluted earnings per share (in shares)	74,604	75,001	74,483	74,763	74,733	74,387	76,862	84,061
Basic earnings per share (in dollars per share)	$ 3.71	$ 3.24	$ 2.92	$ 6.17	$ 9.87	$ 13.42	$ 12.62	$ 10.23
Diluted earnings per share (in dollars per share)	$ 3.64	$ 3.20	$ 2.88	$ 6.08	$ 9.72	$ 13.20	$ 12.42	$ 9.99