Concentration of Risks and Uncertainties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		1 Months Ended
	Mar. 31, 2013 Mill closures due to economic reasons	Apr. 30, 2013 Subsequent Event Fairholme Capital Management, L.L.C.	Apr. 30, 2013 Subsequent Event Fairholme Capital Management, L.L.C. Maximum	Apr. 30, 2013 Subsequent Event Fairholme Capital Management, L.L.C. Minimum
Concentration Risk [Line Items]
Ownership percentage of common stock		27.70%
Cash transferred into investment account		$ 100.0
Percentage of fixed income securities that investment account should have as of trade date			50.00%
Percentage of investment to any one issuer			10.00%
Percentage of investment account that should be held in investment grade cash and cash equivalents				50.00%
Period for monetary damages would be due from third party	1 year