Debt - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2007	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2013
Debt Instrument [Line Items]
Long term debt		$ 63,804,000	$ 44,217,000
Total community development district debt		22,700,000	34,100,000
Cash and cash equivalents		34,515,000	21,894,000	165,980,000	162,391,000
In-substance defeased debt, interest payable monthly at 5.62% at December 31, 2014 and 2013, secured and paid by pledged treasury securities, due October 1, 2015
Debt Instrument [Line Items]
Long term debt	29,300,000	25,670,000	26,260,000
Long term debt, year of balloon payment	2015
Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2016 — May 2039, bearing interest at 2.55% to 7.0% at December 31, 2014 and 2013
Debt Instrument [Line Items]
Long term debt		6,516,000	11,512,000
Construction loan in the Pier Park North joint venture, due February 2016, bearing interest at LIBOR plus 210 basis points, or 2.26% and 2.27% at December 31, 2014 and 2013, respectively | Pier Park North Joint Venture Construction Loan
Debt Instrument [Line Items]
Long term debt		31,618,000	6,445,000
Consolidated Variable Interest Entities | Pier Park North
Debt Instrument [Line Items]
Construction loan						41,000,000
Principal repayment guarantee		33.00%
Cash and cash equivalents		25,000,000
Net worth		350,000,000
Consolidated Variable Interest Entities | Pier Park North | Construction loan in the Pier Park North joint venture, due February 2016, bearing interest at LIBOR plus 210 basis points, or 2.26% and 2.27% at December 31, 2014 and 2013, respectively | Pier Park North Joint Venture Construction Loan
Debt Instrument [Line Items]
Long term debt		$ 31,600,000