Amount and Nature of Net Assets Restricted from Payment of Dividends (Parenthetical) (Detail) (Fixed maturities, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Insurance
Restricted Assets And Liabilities Relating To Securitization [Line Items]
Restricted net assets, amortized cost	$ 9,730	$ 9,607
Lloyd's
Restricted Assets And Liabilities Relating To Securitization [Line Items]
Restricted net assets, amortized cost	$ 398,930	$ 419,271