Earnings Per Share - Summary of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 184,239	$ 147,060
Denominator for basic earnings per share (in shares)	83,475	84,902
Dilutive securities (in shares)	2,289	3,303
Denominator for diluted earnings per share (in shares)	85,764	88,205
Basic earnings per share (in dollars per share)	$ 2.21	$ 1.73
Diluted earnings per share (in dollars per share)	$ 2.15	$ 1.67