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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, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income available to common shareholders	$ 41,976	$ 35,710	$ 31,555	$ 29,471	$ 42,820	$ 37,110	$ 109,241	$ 109,401
Denominator:
Basic weighted average shares outstanding	58,401,183			58,741,973			58,476,430	58,785,546
Effect of dilutive securities:
Diluted weighted average shares outstanding	58,605,726			59,084,117			58,706,960	59,111,303
Basic earnings per share	$ 0.72			$ 0.50			$ 1.87	$ 1.86
Diluted earnings per share	$ 0.72			$ 0.50			$ 1.86	$ 1.85
Stock appreciation rights and options [Member]
Effect of dilutive securities:
Dilutive securities	115,175			177,412			133,030	181,680
Restricted Stock [Member]
Effect of dilutive securities:
Dilutive securities	89,368			164,732			97,500	144,077

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