Accrued Liabilities and Deferred Credits - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 acre	Dec. 31, 2006 acre	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]
Deferred revenue	$ 27,158		$ 29,859
Florida Department of Transportation
Accounts Payable and Accrued Liabilities [Line Items]
Deferred revenue	$ 23,500		$ 23,500
Acres of land sold		3,900
Acres of land remaining to be transferred	1,583