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Income Taxes - Components of Pre-tax Income and Comprehensive Provision for Income Taxes (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Provision for income taxes:      
Deferred income tax expense (benefit) $ 916,000 $ (7,713,000) $ 1,981,000
Tax provision attributable to continuing operations 3,226,000 1,415,000 2,544,000
Tax provision attributable to continuing operations 3,226,000 1,415,000 2,544,000
Comprehensive provision for income tax allocable to:      
Tax provision attributable to continuing operations 3,226,000 1,415,000 2,544,000
Discontinued operations   3,484,000 4,876,000
Tax Provision Excluding Discontinued Operations
      
Provision for income taxes:      
Currently payable 2,310,000 1,633,000 2,677,000
Deferred income tax expense (benefit) 916,000 (218,000) (133,000)
Tax provision attributable to continuing operations 3,226,000 1,415,000 2,544,000
Expected tax expense, at the U.S. federal statutory income tax rate of 35% 3,234,000 1,729,000 2,117,000
State income taxes and other, net 294,000 173,000 337,000
Tax credits (200,000) (170,000) (251,000)
Valuation allowance (102,000) (317,000) 341,000
Tax provision attributable to continuing operations 3,226,000 1,415,000 2,544,000
Comprehensive provision for income tax allocable to:      
Tax provision attributable to continuing operations 3,226,000 1,415,000 2,544,000
Discontinued operations   5,397,000 4,876,000
Total $ 3,226,000 $ 6,812,000 $ 7,420,000