Losses and Loss Adjustment Expenses - Losses Incurred and Paid Reflected Net of Reinsurance Recoverables (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012 Pavonia [Member]
Effects of Reinsurance [Line Items]
Losses and loss adjustment expenses	$ 4,042,130	$ 4,219,905	$ 11,000