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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income	$ 61,366	$ 48,545	$ 47,218	$ 42,402	$ 109,910	$ 89,620
Denominator:
Basic weighted average shares outstanding	115,362,757		115,733,934		115,512,231	115,996,494
Effect of dilutive securities:
Diluted weighted average shares outstanding	115,662,626		116,061,988		115,839,183	116,354,714
Basic earnings per share	$ 0.53		$ 0.41		$ 0.95	$ 0.77
Diluted earnings per share	$ 0.53		$ 0.41		$ 0.95	$ 0.77
Stock appreciation rights [Member]
Effect of dilutive securities:
Dilutive securities	193,466		179,742		200,263	180,594
Restricted stock [Member]
Effect of dilutive securities:
Dilutive securities	106,403		148,312		126,689	177,626

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