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Investments - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Fund
Jun. 30, 2016
USD ($)
Fund
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]        
OTTI charges recognized in net income   $ 147 $ 147  
Number of investment funds | Fund   3 3  
Unfunded commitments   $ 400 $ 400  
Fixed maturities and cash equivalents on deposit with various insurance departments at fair value and amortized cost   6,600 6,600  
Cash equivalents on deposit with another insurance company at fair value and amortized cost   $ 12,100 12,100  
Collateralized mortgage obligations: Non-agency backed - residential        
Schedule of Available-for-sale Securities [Line Items]        
Non credit other than temporary impairment for securities     900 $ 900
Collateralized mortgage obligations: Non-agency backed - commercial        
Schedule of Available-for-sale Securities [Line Items]        
Non credit other than temporary impairment for securities     $ 200 $ 200
Subsequent Event        
Schedule of Available-for-sale Securities [Line Items]        
Final quarterly withdrawal from the limited partnership investments $ 1,000