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Stock-Based Compensation (Detail) - (Table 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total	$ 22,639	$ 23,170	$ 21,076
Restricted Stock [Member]
Allocated Share-based Compensation Expense	18,740	19,143	16,720
Stock Options [Member]
Allocated Share-based Compensation Expense	$ 3,899	$ 4,027	$ 4,356

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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