Earnings Per Share - Summary of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 225,004	$ 234,007	$ 196,247	$ 184,239	$ 209,851	$ 188,817	$ 158,488	$ 147,060	$ 839,497	$ 704,216	$ 895,073
Denominator for basic earnings per share (in shares)	80,228	81,836	83,141	83,475	83,514	83,719	83,895	84,902	82,060	84,005	86,401
Dilutive securities (in shares)									2,001	2,714	3,669
Denominator for diluted earnings per share (in shares)	81,981	83,716	85,295	85,764	85,846	86,273	86,570	88,205	84,061	86,719	90,070
Basic earnings per share (in usd per share)	$ 2.80	$ 2.86	$ 2.36	$ 2.21	$ 2.51	$ 2.26	$ 1.89	$ 1.73	$ 10.23	$ 8.38	$ 10.36
Diluted earnings per share (in usd per share)	$ 2.74	$ 2.80	$ 2.30	$ 2.15	$ 2.44	$ 2.19	$ 1.83	$ 1.67	$ 9.99	$ 8.12	$ 9.94