Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]
Year for audit of federal and state tax return by revenue service	2012
Accrued interest and penalties for uncertain tax positions	$ 0	$ 0	$ 0
Valuation allowance	$ 415,453	$ 415,453
Federal statutory rate	35.00%	35.00%	35.00%
Effective income tax rate including income taxes attributable to the discontinued operations	38.90%	37.50%	41.30%
Uncertain tax positions	$ 0	$ 0	$ 0
Income taxes paid	1,200,000	3,000,000	$ 1,600,000
Charitable Contributions [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 0	$ 0