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Investments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Real Estate Investment [Member]
Mar. 31, 2013
Real Estate Investment [Member]
Mar. 31, 2014
U.S. Treasury and U.S. Government Agencies [Member]
Dec. 31, 2013
U.S. Treasury and U.S. Government Agencies [Member]
Schedule of Investments [Line Items]        
Statutory deposit held in trust with Treasurer of Alabama     $ 108 $ 105
Depreciation and amortization expenses under other investments $ 98 $ 95