Investments - Number of Fixed Maturity Securities with Gross Unrealized Gains and Losses (Detail)	Sep. 30, 2014 Security	Dec. 31, 2013 Security
Investments Debt And Equity Securities [Abstract]
Number of Securities with Gross Unrealized Losses Less than or equal to 12 months	5	12
Number of Securities with Gross Unrealized Losses Greater than 12 months	11	7
Number of Securities with Gross Unrealized Gains	81	83