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Employee Share Plans - Schedule of Share-Based Compensation Awards (Before Income Tax Expense) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Stock options	$ 1,848	$ 2,609	$ 2,105
Restricted stock awards	4,375	4,257	3,600
Performance share units	1,031
Total share-based compensation expense	$ 7,254	$ 6,866	$ 5,705

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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Amount of noncash expense for option under share-based payment arrangement.

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