Notes Payable and Long-Term Debt - Summary of Notes Payable and Long-Term Debt (Footnote) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
LIBOR plus 1.5% payable through 2021, secured by Kailua Town Center III
Debt Instrument [Line Items]
Fixed rate on derivative (in percent)	5.95%
LIBOR plus 1.5% payable through 2021, secured by Kailua Town Center III | LIBOR
Debt Instrument [Line Items]
LIBOR	LIBOR
Basis spread on variable rate	1.50%	1.50%
LIBOR plus 2.66%, payable through 2016, secured by The Shops at Kukui'ula
Debt Instrument [Line Items]
Loan interest rate (in percent)	2.83%	2.82%
LIBOR plus 2.66%, payable through 2016, secured by The Shops at Kukui'ula | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.66%	2.66%
LIBOR plus 2.63%, payable through 2016, secured by Kahala Estate Properties
Debt Instrument [Line Items]
Loan interest rate (in percent)	2.82%	2.78%
LIBOR plus 2.63%, payable through 2016, secured by Kahala Estate Properties | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.63%	2.63%
LIBOR plus 1.0% payable through 2021, secured by asphalt terminal
Debt Instrument [Line Items]
Fixed rate on derivative (in percent)	5.98%
LIBOR plus 1.0% payable through 2021, secured by asphalt terminal | LIBOR
Debt Instrument [Line Items]
LIBOR	LIBOR
Basis spread on variable rate	1.00%	1.00%