Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Federal alternative minimum tax ("AMT") expense	$ 303,000	$ 92,000	$ 42,000
Current state and local tax expense	662,000	254,000	132,000
Deferred Federal tax expense (benefit)	4,962,000	2,118,000	(12,775,000)
Deferred state and local tax expense (benefit)	(513,000)	(4,000)	(1,299,000)
Consolidated income tax expense (benefit), including taxes attributable to discontinued operations	5,414,000	2,460,000	(13,900,000)
Less income tax expense (benefit) attributable to discontinued operations	1,409,000	(382,000)	(230,000)
Income tax expense (benefit)	4,005,000	2,842,000	(13,670,069)
Consolidated income tax expense (benefit), including taxes attributable to discontinued operations	$ 5,414,000	$ 2,460,000	$ (13,900,000)