Real Estate Joint Ventures - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2015	Feb. 28, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2014	Apr. 30, 2014
Variable Interest Entity [Line Items]
Debt			$ 69,726,000		$ 69,726,000			$ 63,804,000
Debt interest rate									4.75%
Operating Expenses			30,213,000	$ 25,282,000	85,040,000	$ 157,002,000
Statements Of Operations
Variable Interest Entity [Line Items]
Operating Expenses			400,000	$ 200,000	1,600,000	$ 1,200,000
Pier Park North Joint Venture Construction Loan | Construction Loans
Variable Interest Entity [Line Items]
Debt			37,625,000		37,625,000			31,618,000
Variable Interest Entities
Variable Interest Entity [Line Items]
Debt			37,625,000		37,625,000			31,618,000
Assets			56,800,000		56,800,000
Liabilities			$ 39,400,000		$ 39,400,000
Pier Park North
Variable Interest Entity [Line Items]
Percentage of cash contribution for joint venture by parent			73.00%		73.00%
Pier Park North | Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Estimated contribution for joint venture by company and its partner							$ 14,400,000
Contribution for joint venture							$ 9,500,000
Percentage of cash contribution for joint venture by parent							66.00%
Noncontrolling interest contribution for joint venture							$ 4,900,000
Percentage of additional cash contribution for joint venture							34.00%
Land contributed to joint venture agreed upon value							$ 6,000,000
Proceeds from sale of property							$ 2,300,000
Construction loan		$ 41,000,000
Construction loan, term of optional renewal extension		2 years
Principal repayment guarantee			33.00%		33.00%
Debt instrument, covenant compliance, minimum liquidity amount		$ 25,000,000
Net worth		$ 350,000,000
Pier Park North | Consolidated Variable Interest Entities | Subsequent Event
Variable Interest Entity [Line Items]
Percentage of cash contribution for joint venture by parent	60.00%
Percentage of additional cash contribution for joint venture	40.00%
Pier Park North | Consolidated Variable Interest Entities | Pier Park North Joint Venture Construction Loan | Subsequent Event
Variable Interest Entity [Line Items]
Construction loan	$ 48,200,000
Debt interest rate	4.10%
Letters of Credit Outstanding, Amount	$ 6,620,000
Proceeds from Construction Loans Payable	6,300,000
Net worth	36,000,000
Pier Park North | Consolidated Variable Interest Entities | Pier Park North Joint Venture Construction Loan | Subsequent Event | Land
Variable Interest Entity [Line Items]
Proceeds from Construction Loans Payable	$ 3,700,000
Pier Park North | Consolidated Variable Interest Entities | Pier Park North Joint Venture Construction Loan | Construction Loans
Variable Interest Entity [Line Items]
Debt			$ 37,600,000		$ 37,600,000			$ 31,600,000
Artisan Park, L.L.C | Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Percentage of cash contribution for joint venture by parent			74.00%		74.00%