Investments - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2014 Funds	Sep. 30, 2013 Collateralized Non Agency Backed Residential Obligations	Sep. 30, 2013 Collateralized Non Agency Backed Residential Obligations	Sep. 30, 2014 Collateralized Mortgage Obligations [Member] Collateralized Non Agency Backed Residential Obligations	Dec. 31, 2013 Collateralized Mortgage Obligations [Member] Collateralized Non Agency Backed Residential Obligations	Sep. 30, 2014 Collateralized Mortgage Obligations [Member] Collateralized Non Agency Backed Commercial Obligations	Dec. 31, 2013 Collateralized Mortgage Obligations [Member] Collateralized Non Agency Backed Commercial Obligations
Schedule of Available-for-sale Securities [Line Items]
Number of investment funds			3
Unfunded commitments			$ 3,000,000
Fixed maturities and cash equivalents on deposit with various insurance departments at fair value and amortized cost			5,200,000
Cash equivalents on deposit with another insurance company at fair value and amortized cost			9,400,000
Non credit other than temporary impairment for securities						900,000	900,000	200,000	200,000
OTTI charges recognized in net income (loss)	$ 33,000	$ 61,000		$ 33,000	$ 61,000