Earnings per Common Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings per common share—basic
Net income	$ 272,461	$ 28,894
Weighted-average common shares outstanding—basic (in shares)	117,482	94,309
Basic earnings per common share (usd per share)	$ 2.32	$ 0.31
Earnings per common share—diluted
Weighted-average common shares outstanding—basic (in shares)	117,482	94,309
Convertible notes weighted-average shares outstanding (in shares)	5,361	0
Options and restricted stock and performance share units (in shares)	1,727	1,367
Weighted-average common shares outstanding—diluted (in shares)	124,570	95,676
Dilutive earnings per common share (usd per share)	$ 2.19	$ 0.30