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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Investment Income [Line Items]                      
Total investment income                 $ 3,550 $ 1,337 $ 1,483
Less investment expenses                 (1,622) (896) (695)
Net investment (expense) income 1,397 382 137 12 278 215 (16) (36) 1,928 441 788
Cash and Cash Equivalents [Member]
                     
Net Investment Income [Line Items]                      
Total investment income                 148 705 568
Fixed Maturities [Member]
                     
Net Investment Income [Line Items]                      
Total investment income                 1,420 66 494
Equity Securities [Member]
                     
Net Investment Income [Line Items]                      
Total investment income                 $ 1,982 $ 566 $ 421