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Income Taxes - Schedule of Differences Between Federal Tax Rate and Company's Effective Tax Rate for Results of Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
U.S. tax at statutory rate $ 10,415 $ 10,299 $ 9,979
State income taxes, net of federal benefit 1,814 1,219 963
Deductible losses (98) (404)   
Nontaxable gain       (1,342)
Nondeductible expenses 105 101 98
Total income tax provision for continuing operations $ 12,236 $ 11,215 $ 9,698
U.S. tax at statutory rate, percentage 35.00% 35.00% 35.00%
State income taxes, net of federal benefit, percentage 6.10% 4.20% 3.40%
Deductible losses, percentage (0.30%) (1.40%) 0.00%
Nontaxable gain, percentage     (4.70%)
Nondeductible expenses, percentage 0.30% 0.30% 0.30%
Total 41.10% 38.10% 34.00%