Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Income before income taxes	$ 2,540,000	$ 4,198,000
Income tax provision	$ 915,000	$ 1,268,000
Effective tax rate	36.00%	30.20%
Expected effective tax rate				25.90%
Latest Tax Year
Income Taxes [Line Items]
Net operating loss and business tax credit carry forwards expiration date	At various dates through December 2035.
Scenario, Forecast
Income Taxes [Line Items]
Expected effective tax rate			26.50%
Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]
Net operating loss carry forwards	$ 46,984,000
Business tax credit carry forwards	$ 1,920,000