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Financial Assets and Financial Liabilities - Description of Significant Unobservable Inputs to Valuation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]
Liquidity discount	30.00%	30.00%
Other equity securities [Member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]
Valuation technique	Market Approach Method
Significant unobservable inputs	Liquidity Discount
Liquidity discount	30.00%	30.00%
Sensitivity of the input to fair value	5% decrease in the discount would increase in fair value by $290	5% decrease in the discount would increase in fair value by $167
Increase in fair value due to a decrease in the liquidity discount	$ 290	$ 167

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- Definition

Liquidity discount rate.

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- Definition

The description of the methods used to develop and substantiate the unobservable inputs used in the fair value measurement of assets.

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The description of the sensitivity of the fair value measurement of assets to changes in unobservable inputs if a change to those inputs might result in a higher or lower fair value measurement.

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The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques [member]; Cost approach [member]; Income approach [member]; Market approach [member]]

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

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The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible increase in an unobservable input.

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