Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income available to common shareholders	$ 65,266	$ 77,036	$ 41,131	$ 14,423	$ 88,916	$ 71,211	$ 183,433	$ 174,549
Denominator:
Basic weighted average shares outstanding	108,583,009			110,140,496			108,707,699	112,609,684
Effect of dilutive securities:
Diluted weighted average shares outstanding	108,702,495			110,300,017			108,829,374	112,787,994
Basic earnings per share	$ 0.6			$ 0.13			$ 1.69	$ 1.55
Diluted earnings per share	$ 0.6			$ 0.13			$ 1.69	$ 1.55
Stock appreciation rights [Member]
Effect of dilutive securities:
Dilutive securities	80,256			85,396			72,580	101,967
Restricted stock [Member]
Effect of dilutive securities:
Dilutive securities	39,230			74,125			49,095	76,343