Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Insurance coverage	$ 250,000
Cash and cash equivalents in excess of insured limit	1,386,000
Asset impairment loss	0	$ 0
Amortization expense for finance costs	$ 17,788	26,562
Average life of membership	12 years
Rental pool distributions	$ 2,600,000	3,100,000
Income tax expense recorded	0
Uncertain income tax positions	$ 0	$ 0
Year under income tax examination		2018	2017	2016
Federal income tax returns period	3 years
Selling and Marketing Expense [Member]
Significant Accounting Policies [Line Items]
Advertising costs	$ 248,000	$ 404,000