Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Allowance for uncollectable reinsurance
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at January 1, 2013	$ 11,520
Charged (Credited) to Costs and Expenses	(188)
Charged to Other Accounts
Deductions (Describe)
Balance at December 31, 2013	11,332
Valuation allowance in deferred taxes
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at January 1, 2013	499
Charged (Credited) to Costs and Expenses	55
Charged to Other Accounts
Deductions (Describe)
Balance at December 31, 2013	$ 554