Insurance Activity - Components of Liability for Losses and Loss Adjustment Reserves (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]	Dec. 31, 2012 Successor [Member] Case-basis reserves [Member]	Dec. 31, 2012 Successor [Member] IBNR reserves [Member]	Dec. 31, 2012 Successor [Member] Premium deficit reserves [Member]	Dec. 31, 2011 Predecessor [Member]	Dec. 31, 2010 Predecessor [Member]	Dec. 31, 2009 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member] Case-basis reserves [Member]	Dec. 31, 2010 Predecessor [Member] Case-basis reserves [Member]	Dec. 31, 2011 Predecessor [Member] IBNR reserves [Member]	Dec. 31, 2010 Predecessor [Member] IBNR reserves [Member]	Dec. 31, 2011 Predecessor [Member] Premium deficit reserves [Member]	Dec. 31, 2010 Predecessor [Member] Premium deficit reserves [Member]
Losses and loss adjustment reserves	$ 82,524	$ 142,119	$ 66,173	$ 1,298	$ 15,053	$ 142,119	$ 190,036	$ 256,426	$ 132,970	$ 174,858	$ 6,049	$ 9,028	$ 3,100	$ 6,150