Senior Notes, Secured, and Subordinated Indebtedness - Schedule of Maturities of Notes Payable, Senior Unsecured Credit Facility, Subordinated Amortizing Notes and Senior Notes (Footnote) (Details)	12 Months Ended
	Dec. 31, 2015
December 2013, March 2014, August 2015, November 2015 Construction Notes Payable | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
December 2013, March 2014, August 2015, November 2015 Construction Notes Payable | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
November 2014, April 2015, July 2015 Construction Notes Payable | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%