Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Benefit for carryback of additional 2017 tax losses		$ 986,000
AMT credits refund	$ 13,000	433,000
Untaxed foreign earnings		2,369,000
U.S. federal net operating loss	0
GILTI inclusion	$ 4,859,000	0
Valuation allowance methodology and assumptions, description	During 2018, the Corporation also released the valuation allowance previously established against the net deferred income tax assets of one of its foreign subsidiaries of $1,242 on the basis that it was “more likely than not” the net deferred income tax assets would be realized.
Valuation allowance, deferred income tax assets of foreign subsidiaries		1,242,000
Deferred tax liability recorded	$ 0	$ 0
2035 [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	6,734,000
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 42,517,000
Operating loss carry forwards expiration period	2035
Operating loss carryforwards, limitations on use	the Corporation has U.S. federal net operating loss carryforwards of $42,517, of which $35,783 can be carried forward indefinitely but will be limited to 80 percent of taxable income in any given year.
State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 54,560,000
Operating loss carry forwards expiration period	2020
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 50,792,000
Capital loss carryforwards	$ 768,000
Capital loss carry forwards expiration period	Capital loss carryforwards of $768 which do not expire
Carried Forward Indefinitely [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 35,783,000