Notes Receivable, net (Descriptors) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Apr. 02, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred profit	$ 15,309,000	$ 28,551,000
Interest bearing homebuilder note for the RiverTown Sale, secured by the real estate sold — 5.25% interest rate, annual principal payment of $1.0 million due March 2015 and with all accrued interest and remaining principal and interest payment due June 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, effective interest rate	5.25%		5.25%
Notes receivable, annual principal payments	1,000,000.0
Interest bearing homebuilder notes, secured by the real estate sold — 4.0% interest rate, annual principal payments of $0.3 million, any remaining payments outstanding are due February and August 2015, net of deferred profit of $0.1 million and $0.7 million at December 31, 2014 and 2013, respectively
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, effective interest rate	4.00%	4.00%
Notes receivable, annual principal payments	300,000.0	300,000.0
Deferred profit	100,000	700,000
Pier Park Community Development District notes, non-interest bearing, due December 2024, net of unamortized discount of $0.1 million, effective rates 5.73% — 8.0%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized discount	$ 0	$ 0
Note receivable, maturity date	2024-12	2024-12
Pier Park Community Development District notes, non-interest bearing, due December 2024, net of unamortized discount of $0.1 million, effective rates 5.73% — 8.0% | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, effective interest rate	5.73%	5.73%
Pier Park Community Development District notes, non-interest bearing, due December 2024, net of unamortized discount of $0.1 million, effective rates 5.73% — 8.0% | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, effective interest rate	8.00%	8.00%