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Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Shares
Outstanding at beginning of period | shares	4,766,150
Expired | shares	(710,000)
Outstanding at end of period | shares	4,056,150
Exercisable at end of year | shares	4,026,150
Weighted Average Exercise Price Per Share
Outstanding at beginning of period | $ / shares	$ 20.62
Expired | $ / shares	14.83
Outstanding at end of period | $ / shares	21.63
Exercisable at end of year | $ / shares	$ 21.65

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Publisher FASB
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-Topic 718
-SubTopic 10
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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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