Accrued Liabilities and Deferred Credits - Additional Information (Details) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 27, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2006 a	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred revenue		$ 15,484	$ 15,484			$ 15,309
Accruals for fees and expenses for the SEC investigation		5,781	5,781			0
Liability For Potential Settlement Of Ongoing SEC Investigation		3,500	3,500		$ 3,500
Legal Fees		500	4,400
Accrued Professional Fees		2,300	2,300
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Litigation Settlement, Amount	$ 2,750
Florida Department of Transportation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred revenue		$ 12,500	$ 12,500			$ 12,500
Acres of land sold | a				3,900