Debt Additional Information (Details) (USD $)			12 Months Ended								1 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2007 In-substance defeased debt, interest payable monthly at 5.62% at September 30, 2014 and December 31, 2013, secured and paid by pledged treasury securities, due October 1, 2015	Sep. 30, 2014 In-substance defeased debt, interest payable monthly at 5.62% at September 30, 2014 and December 31, 2013, secured and paid by pledged treasury securities, due October 1, 2015	Dec. 31, 2013 In-substance defeased debt, interest payable monthly at 5.62% at September 30, 2014 and December 31, 2013, secured and paid by pledged treasury securities, due October 1, 2015	Sep. 30, 2014 Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2016 — May 2039, bearing interest at 2.25% to 7.0% at September 30, 2014 and December 31, 2013 Rivers Edge CDD Assessments	Apr. 02, 2014 Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2016 — May 2039, bearing interest at 2.25% to 7.0% at September 30, 2014 and December 31, 2013 Rivers Edge CDD Assessments	Mar. 31, 2014 Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2016 — May 2039, bearing interest at 2.25% to 7.0% at September 30, 2014 and December 31, 2013 Rivers Edge CDD Assessments	Sep. 30, 2014 Construction loan in the Pier Park North joint venture, due February 2016, bearing interest at LIBOR plus 210 basis points, or 2.25% and 2.27% at September 30, 2014 and December 31, 2013, respectively Pier Park North Joint Venture Construction Loan	Dec. 31, 2013 Construction loan in the Pier Park North joint venture, due February 2016, bearing interest at LIBOR plus 210 basis points, or 2.25% and 2.27% at September 30, 2014 and December 31, 2013, respectively Pier Park North Joint Venture Construction Loan	Feb. 28, 2013 Consolidated Variable Interest Entities Pier Park North	Sep. 30, 2014 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 2.25% and 2.27% at September 30, 2014 and December 31, 2013, respectively Pier Park North Joint Venture Construction Loan	Dec. 31, 2013 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 2.25% and 2.27% at September 30, 2014 and December 31, 2013, respectively Pier Park North Joint Venture Construction Loan
Debt Instrument [Line Items]
Long term debt	$ 60,678,000	$ 44,217,000	$ 29,300,000	$ 25,822,000	$ 26,260,000		$ 11,000,000		$ 28,922,000	$ 6,445,000		$ 28,900,000	$ 6,400,000
Long term debt, year of balloon payment			2015
Total community development district debt	22,100,000	34,100,000				11,000,000		5,400,000
Construction loan											$ 41,000,000
Construction loan, term of optional renewal extension											2 years