Long-Term Debt - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended		3 Months Ended		9 Months Ended				1 Months Ended	9 Months Ended		9 Months Ended			1 Months Ended			3 Months Ended	9 Months Ended		1 Months Ended
	Feb. 14, 2013	Mar. 29, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Hilton Resorts Corporation [Member] Buildings	Feb. 27, 2012 Note Payable to Banks [Member]	Sep. 30, 2013 UBS Note Payable [Member]	Feb. 22, 2013 UBS Note Payable [Member]	Sep. 30, 2013 BOA Note Payable [Member]	Mar. 08, 2013 BOA Note Payable [Member] Property	Feb. 27, 2012 Line of Credit New [Member]	Feb. 27, 2012 Line of Credit New [Member] Minimum [Member]	Feb. 27, 2012 Line of Credit New [Member] Maximum [Member]	Feb. 27, 2012 Bank of Montreal [Member]	Mar. 31, 2012 SunTrust Bank [Member]	Sep. 30, 2013 SunTrust Bank [Member]	Mar. 29, 2013 Line of Credit Facility Second Amendment [Member]	Mar. 29, 2013 Line of Credit Facility Second Amendment [Member] Minimum [Member]	Mar. 29, 2013 Line of Credit Facility Second Amendment [Member] Maximum [Member]	Sep. 30, 2013 Line of Credit Amended [Member]
Proforma Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				$ 66,000,000		$ 66,000,000									$ 46,000,000					$ 25,000,000	$ 125,000,000			$ 66,000,000
Expiration date of line of credit		Mar. 31, 2016																Feb. 27, 2015		Sep. 27, 2014
Long-term debt LIBOR plus interest rate, reckoning period										30 days
Interest rate description																LIBOR plus 175 basis points	LIBOR plus 250 basis points					LIBOR plus 150 basis points	LIBOR plus 225 basis points
LIBOR plus interest rate																1.75%	2.50%					1.50%	2.25%
Initial disbursement of credit facility																				9,700,000
Term loan						47,649,817	20,881,714													5,600,000
Term loan maturity date																				Jul. 01, 2012
Deferred loan costs write off							245,726												245,726
Capacity available on existing credit facility	66,000,000		62,000,000
Amount of loan closed				66,727,032		66,727,032		29,126,849			7,300,000	7,300,000	23,100,000	23,100,000
Maturity period											2018-02		2023-04
Interest rate on mortgage loan											3.655%		3.67%
Number of office building									2
Date of acquisition											Jan. 31, 2013
Number of income properties														14
Debt instrument decrease in variable interest rate																					0.25%
Credit facility capacity available				29,700,000		29,700,000
Interest expense				455,670	124,650	1,168,109	401,060
Interest paid				454,828	118,512	1,117,583	367,703
Interest capitalized						0	0
Amortization of loan costs				$ 54,228	$ 28,197	$ 147,917	$ 74,389