Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended			6 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]	Sep. 30, 2014 Fmkt [Member]	Sep. 30, 2014 Real Estate Investment [Member]	Sep. 30, 2013 Real Estate Investment [Member]	Sep. 30, 2014 Real Estate Investment [Member]	Sep. 30, 2013 Real Estate Investment [Member]	Jun. 30, 2014 ADC Arrangement [Member]	Sep. 30, 2014 ADC Arrangement [Member]	Sep. 30, 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														$ 111	$ 105
Equity interest percentage		90.00%					10.00%
Cash contribution		4,500	0				500
Distribution	0	0
Maximum exposure loss relating to VIE	4,478	4,478
Undistributed loss from equity investment method		(22)
Depreciation and amortization expenses under real estate investments								100	99	298	290
Maximum Amount of Loan Receivable				$ 9,785
Percentage of rentable space secured												90.00%
Term of Loan Receivable					24 months	36 months
Interest Rate on Loan Receivable												6.00%
ADC Arrangement		The Company has an acquisition, development and construction loan arrangement (“ADC Arrangement”) under which it provides financing to a property developer for the acquisition, development, and construction of a retail shopping center. The Company also expects to participate in the residual profit resulting from the ultimate sale or other use of the property. Classification and accounting for the ADC Arrangement as a loan, an investment in real estate, or joint venture is determined by the Company’s evaluation of the characteristics and the risks and rewards of the ADC Arrangement. If the Company expects to receive more than 50% of the residual profit from the ADC arrangement and it has characteristics similar to a real estate investment, the costs of the real estate project will be capitalized and interest will be recognized in net investment income											Based on the characteristics of this ADC Arrangement which are similar to those of an investment, combined with the expected residual profit being greater than 50%, the arrangement is accounted for and reported in the balance sheet as a real estate investment