Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Current Federal alternative minimum tax ("AMT") expense	$ 62,000	$ 38,000
Current state and local tax expense	61,000
Deferred Federal tax expense	811,000	622,000
Deferred state and local tax expense	53,000	87,000
Consolidated income tax expense, including taxes attributable to discontinued operations	987,000	747,000
Less income tax expense (benefit) attributable to discontinued operations		(47,000)
Income tax expense	987,000	794,000
Consolidated income tax expense, including taxes attributable to discontinued operations	$ 987,000	$ 747,000