Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes Disclosure [Line Items]
US federal tax rate			21.00%		35.00%
Net operating losses carryback period			2 years
Capital losses carryback period			3 years
Change in valuation allowance	$ (200,000)	$ 800,000	$ (3,600,000)	$ (300,000)
Loss carryforwards per year	2,800,000		2,800,000
Unrecognized tax benefits	0	$ 0	0	$ 0
Brazil [Member]
Income Taxes Disclosure [Line Items]
Valuation allowance	6,300,000		6,300,000
Italy [Member]
Income Taxes Disclosure [Line Items]
Valuation allowance	6,300,000		6,300,000
Malta [Member]
Income Taxes Disclosure [Line Items]
Valuation allowance	1,000,000		1,000,000
Maybrooke [Member]
Income Taxes Disclosure [Line Items]
Valuation allowance	1,200,000		1,200,000
PXRE Corporation [Member]
Income Taxes Disclosure [Line Items]
Net operating loss carryforward	6,800,000		6,800,000
ARIS [Member]
Income Taxes Disclosure [Line Items]
Net operating loss carryforward	$ 600,000		$ 600,000