Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Net deferred tax assets	$ 37,841,000	$ 32,183,000
Valuation allowance	$ 344,000	$ 3,535,000
Effective tax rate	52.70%	2.00%	(48.00%)
Liability for uncertain tax positions	$ 0	$ 0
Interest related to tax uncertainties	0	0
Accrued interest related to uncertain tax	$ 0	$ 0
Audit tax years	2011 through 2013
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 32,513,000
Pre-tax capital loss carryforwards	0
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	8,626,000
Tax benefit related to windfalls	$ 0
State net operating losses carryovers, Beginning year	2028
Pre-tax capital loss carryforwards	$ 8,836,000
Capital loss carryforwards expiration dates	2017