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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]      
Valuation allowance of state tax benefits not expected to be utilized $ 216,000 $ 1,078,000  
Unrecognized tax benefits 0 0  
Increase (decrease) in state tax benefit 1,700,000 $ (720,000) $ 249,000
State [Member]      
Income Tax Disclosure [Line Items]      
Tax credit carry forwards $ 1,000,000    
Capital Loss Carry Forward [Member]      
Income Tax Disclosure [Line Items]      
Tax credit carry forwards expiration date Dec. 31, 2015    
Federal General Business Tax Credit Carry Forward [Member]      
Income Tax Disclosure [Line Items]      
Tax credit carry forwards $ 0    
Alternative Minimum Tax Credit Carry Forward [Member]      
Income Tax Disclosure [Line Items]      
Tax credit carry forwards $ 1,800,000