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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities by Contractual Maturity (Total Available-for-sale Securities) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investment [Line Items]    
Less than one year, Cost Basis $ 30,653  
One to five years, Cost Basis 21,431  
Five to ten years, Cost Basis 18,252  
More than ten years, Cost Basis 120,833  
Total, Cost Basis 201,587 144,514
Less than one year, Fair Value 30,679  
One to five years, Fair Value 21,653  
Five to ten years, Fair Value 18,370  
More than ten years, Fair Value 120,233  
Total, Fair Value 199,374 149,139
U.S. agency-based mortgage-backed securities [Member]
    
Investment [Line Items]    
U.S. agency-based mortgage-backed securities, Cost Basis 10,418  
U.S. agency-based mortgage-backed securities, Fair Value $ 8,439