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Investments - Summary of Other Invested Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Real Estate [Abstract]    
Land $ 11,009 $ 10,993
Land improvements 1,351 1,326
Buildings 2,873 2,869
Other 1,311 1,238
Total, at cost 16,544 16,426
Less: accumulated depreciation and amortization (530) (339)
Other investments $ 16,014 $ 16,087