This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.

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- Definition

Aggregate number of common shares reserved for future issuance.

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Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Stockholders' Equity - Additional information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock repurchased as per November plan				$ 30,000,000
Stock repurchase program amount available	$ 8,541,000
Stock repurchase	0	0	0
Cash dividends paid to outside shareholders	$ 139,000
Subsidiaries [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends on subsidiary common stock	3,602,000	$ 632,000
Cash dividends paid to the Company	3,463,000
Cash dividends paid to outside shareholders	$ 139,000
2000 Plan, Vicor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock reserved for issuance	20,895,747	21,233,659	21,976,340