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Additional Information with Respect to Options Granted, Vested and Exercised (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Aggregate grant date fair value of stock options vested during the year	$ 543	$ 1,954	$ 4,565
Aggregate intrinsic value of stock options exercised			$ 209

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Grant Date Fair Value of Options Vested.

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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