Indebtedness - Schedule of Debt (Detail) - USD ($) $ in Thousands					12 Months Ended
	Jul. 30, 2015	Jul. 10, 2015	Jul. 01, 2015	May. 27, 2015	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total					$ 382,013	$ 360,671
Unamortized fair value adjustments					(1,287)	(1,442)
Unamortized debt issuance expense					(3,133)	(2,884)
Indebtedness, net					377,593	356,345
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total					$ 74,000	59,000
Stated Maturity Date					Feb. 20, 2019
Revolving Credit Facility [Member] | LIBOR [Member] | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.40%
Revolving Credit Facility [Member] | LIBOR [Member] | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					2.00%
Senior Unsecured Term Loan Facility [Member]
Debt Instrument [Line Items]
Total					$ 50,000
Stated Maturity Date					Feb. 20, 2020
Senior Unsecured Term Loan Facility [Member] | LIBOR [Member] | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.35%
Senior Unsecured Term Loan Facility [Member] | LIBOR [Member] | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.95%
249 Central Park Retail
Debt Instrument [Line Items]
Total					$ 15,282	15,566
Stated Interest Rate (as a percent)					5.99%
Stated Maturity Date					Sep. 08, 2016
Fountain Plaza Retail
Debt Instrument [Line Items]
Total					$ 7,641	7,783
Stated Interest Rate (as a percent)					5.99%
Stated Maturity Date					Sep. 08, 2016
South Retail
Debt Instrument [Line Items]
Total					$ 6,742	6,867
Stated Interest Rate (as a percent)					5.99%
Stated Maturity Date					Sep. 08, 2016
4525 Main Street
Debt Instrument [Line Items]
Total					$ 31,613	30,870
Stated Maturity Date					Jan. 30, 2017
4525 Main Street | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.95%
Encore Apartments
Debt Instrument [Line Items]
Total					$ 25,184	22,215
Stated Maturity Date					Jan. 30, 2017
Encore Apartments | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.95%
North Point Center | Notes 1 [Member]
Debt Instrument [Line Items]
Total					$ 9,969	10,149
Stated Interest Rate (as a percent)					6.45%
Stated Maturity Date					Feb. 05, 2019
North Point Center | Notes 2 [Member]
Debt Instrument [Line Items]
Total					$ 2,662	2,753
Stated Interest Rate (as a percent)					7.25%
Stated Maturity Date					Sep. 15, 2025
North Point Center | Note 5 [Member]
Debt Instrument [Line Items]
Total					$ 664	685
Stated Maturity Date					Feb. 01, 2017
North Point Center | Note 5 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					2.00%
Oyster Point
Debt Instrument [Line Items]
Total					$ 6,400	6,274
Stated Maturity Date					Feb. 28, 2017
Oyster Point | LIBOR [Member] | Minimum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.40%
Oyster Point | LIBOR [Member] | Maximum
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					2.00%
Harrisonburg Regal
Debt Instrument [Line Items]
Total					$ 3,463	3,659
Stated Interest Rate (as a percent)					6.06%
Stated Maturity Date					Jun. 08, 2017
Commonwealth of Virginia [Member] | Chesapeake
Debt Instrument [Line Items]
Total					$ 4,933	3,585
Stated Maturity Date					Aug. 28, 2017
Commonwealth of Virginia [Member] | Chesapeake | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.90%
Hanbury Village | Notes 1 [Member]
Debt Instrument [Line Items]
Total					$ 20,970	21,218
Stated Maturity Date					Oct. 11, 2017
Hanbury Village | Notes 1 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Stated Interest Rate (as a percent)					6.67%
Hanbury Village | Notes 2 [Member]
Debt Instrument [Line Items]
Total						4,090
Lightfoot Marketplace
Debt Instrument [Line Items]
Total					$ 7,759	3,484
Stated Maturity Date					Nov. 14, 2017
Lightfoot Marketplace | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.90%
Sandbridge Commons
Debt Instrument [Line Items]
Total					$ 9,010	5,892
Stated Maturity Date					Jan. 17, 2018
Sandbridge Commons | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					1.85%
Columbus Village
Debt Instrument [Line Items]
Stated Maturity Date		Apr. 05, 2018
Columbus Village | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate		2.00%
Columbus Village | Notes 1 [Member]
Debt Instrument [Line Items]
Total					$ 6,429
Stated Maturity Date					Apr. 05, 2018
Columbus Village | Notes 1 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					2.00%
Columbus Village | Notes 2 [Member]
Debt Instrument [Line Items]
Total					$ 2,310
Stated Maturity Date					Apr. 05, 2018
Columbus Village | Notes 2 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate					2.00%
Johns Hopkins Village
Debt Instrument [Line Items]
Total					$ 3,968
Stated Maturity Date	Jul. 30, 2018				Jul. 30, 2018
Johns Hopkins Village | LIBOR [Member]
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate	1.90%				1.90%
Socastee Commons
Debt Instrument [Line Items]
Total					$ 4,957
Stated Interest Rate (as a percent)			4.57%		4.57%
Stated Maturity Date			Jan. 06, 2023		Jan. 06, 2023
Smith's Landing
Debt Instrument [Line Items]
Total					$ 21,226	24,470
Stated Interest Rate (as a percent)				4.05%	4.05%
Stated Maturity Date				Jun. 01, 2035	Jun. 01, 2035
Liberty Apartments
Debt Instrument [Line Items]
Total					$ 20,312	20,603
Stated Interest Rate (as a percent)					5.66%
Stated Maturity Date					Nov. 01, 2043
The Cosmopolitan
Debt Instrument [Line Items]
Total					$ 46,519	47,132
Stated Interest Rate (as a percent)					3.75%
Stated Maturity Date					Jul. 01, 2051
Broad Creek Shopping Center | Notes 1 [Member]
Debt Instrument [Line Items]
Total						4,452
Broad Creek Shopping Center | Notes 2 [Member]
Debt Instrument [Line Items]
Total						8,173
Broad Creek Shopping Center | Notes 3 [Member]
Debt Instrument [Line Items]
Total						3,422
Commerce Street Retail
Debt Instrument [Line Items]
Total						5,549
Dick's at Town Center
Debt Instrument [Line Items]
Total						8,216
Oceaneering
Debt Instrument [Line Items]
Total						13,490
Studio 56 Retail
Debt Instrument [Line Items]
Total						2,618
Tyre Neck Harris Teeter
Debt Instrument [Line Items]
Total						2,437
Whetstone Apartments
Debt Instrument [Line Items]
Total						$ 16,019