Summary of Secured Debt (Detail) (USD $)			12 Months Ended			12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended						0 Months Ended	12 Months Ended				12 Months Ended			12 Months Ended			12 Months Ended		12 Months Ended			12 Months Ended				12 Months Ended						12 Months Ended						12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Secured Debt [Member]	Dec. 31, 2012 Secured Debt [Member]	Dec. 31, 2013 Knoxville Portfolio Property	Dec. 31, 2013 Prudential Portfolio Loan		Dec. 31, 2013 Prudential Portfolio Loan Secured Debt [Member]		Dec. 31, 2012 Prudential Portfolio Loan Secured Debt [Member]		Dec. 31, 2013 Dufferin - Toronto - Ontario, Canada		Dec. 31, 2013 Dufferin - Toronto - Ontario, Canada Secured Debt [Member]		Dec. 31, 2012 Dufferin - Toronto - Ontario, Canada Secured Debt [Member]		Dec. 31, 2013 Citi Loan		Dec. 31, 2013 Citi Loan Secured Debt [Member]		Dec. 31, 2012 Citi Loan Secured Debt [Member]		Dec. 31, 2013 Citi Las Vegas Loan		Dec. 31, 2013 Citi Las Vegas Loan Secured Debt [Member]		Dec. 31, 2012 Citi Las Vegas Loan Secured Debt [Member]		Dec. 31, 2013 ING Loan		Dec. 31, 2013 ING Loan Secured Debt [Member]		Dec. 31, 2012 ING Loan Secured Debt [Member]		Dec. 31, 2013 Mississauga - Ontario, Canada		Dec. 31, 2013 Mississauga - Ontario, Canada Secured Debt [Member]		Dec. 31, 2012 Mississauga - Ontario, Canada Secured Debt [Member]		Dec. 31, 2013 Chantilly - VA		Dec. 31, 2013 Chantilly - VA Secured Debt [Member]		Dec. 31, 2012 Chantilly - VA Secured Debt [Member]		Dec. 31, 2013 Citi Stockade Loan - 1		Dec. 31, 2013 Citi Stockade Loan - 1 Secured Debt [Member]		Dec. 31, 2012 Citi Stockade Loan - 1 Secured Debt [Member]		Dec. 31, 2013 KeyBank CMBS Loan		Dec. 31, 2013 KeyBank CMBS Loan Secured Debt [Member]		Dec. 31, 2012 KeyBank CMBS Loan Secured Debt [Member]		Dec. 31, 2013 Citi Stockade Loan - 2		Dec. 31, 2013 Citi Stockade Loan - 2 Secured Debt [Member]		Dec. 31, 2012 Citi Stockade Loan - 2 Secured Debt [Member]		Dec. 31, 2013 Montgomery	Dec. 31, 2013 Montgomery Secured Debt [Member]	Dec. 31, 2012 Montgomery Secured Debt [Member]	Dec. 31, 2013 Seabrook	Dec. 31, 2013 Seabrook Secured Debt [Member]	Dec. 31, 2012 Seabrook Secured Debt [Member]	Dec. 31, 2013 Greenville	Dec. 31, 2013 Greenville Secured Debt [Member]	Dec. 31, 2012 Greenville Secured Debt [Member]	Dec. 31, 2013 Kemah	Dec. 31, 2013 Kemah Secured Debt [Member]	Dec. 31, 2012 Kemah Secured Debt [Member]	Dec. 31, 2013 Memphis	Dec. 31, 2013 Memphis Secured Debt [Member]	Dec. 31, 2012 Memphis Secured Debt [Member]	Dec. 31, 2013 Tallahassee	Dec. 31, 2013 Tallahassee Secured Debt [Member]	Dec. 31, 2012 Tallahassee Secured Debt [Member]	Dec. 31, 2013 Houston	Dec. 31, 2013 Houston Secured Debt [Member]	Dec. 31, 2012 Houston Secured Debt [Member]	Dec. 31, 2013 San Francisco (consolidated VIE)	Dec. 31, 2013 San Francisco (consolidated VIE) Secured Debt [Member]	Dec. 31, 2012 San Francisco (consolidated VIE) Secured Debt [Member]	Dec. 31, 2013 Lake Forest	Dec. 31, 2013 Lake Forest Secured Debt [Member]	Dec. 31, 2012 Lake Forest Secured Debt [Member]	Dec. 31, 2013 Las Vegas II	Dec. 31, 2013 Las Vegas II Secured Debt [Member]	Dec. 31, 2012 Las Vegas II Secured Debt [Member]	Dec. 31, 2013 Pearland	Dec. 31, 2013 Pearland Secured Debt [Member]	Dec. 31, 2012 Pearland Secured Debt [Member]	Dec. 31, 2013 Daphne	Dec. 31, 2013 Daphne Secured Debt [Member]	Dec. 31, 2012 Daphne Secured Debt [Member]	Dec. 31, 2013 Mesa	Dec. 31, 2013 Mesa Secured Debt [Member]	Dec. 31, 2012 Mesa Secured Debt [Member]	Dec. 31, 2013 Riverdale	Dec. 31, 2013 Riverdale Secured Debt [Member]	Dec. 31, 2012 Riverdale Secured Debt [Member]	Dec. 31, 2013 Bank of America Loan - 1		Dec. 31, 2013 Bank of America Loan - 1 Secured Debt [Member]		Dec. 31, 2012 Bank of America Loan - 1 Secured Debt [Member]		Dec. 31, 2013 Bank of America Loan - 2		Dec. 31, 2013 Bank of America Loan - 2 Secured Debt [Member]		Dec. 31, 2012 Bank of America Loan - 2 Secured Debt [Member]		Dec. 31, 2013 Bank of America Loan - 3		Dec. 31, 2013 Bank of America Loan - 3 Secured Debt [Member]		Dec. 31, 2012 Bank of America Loan - 3 Secured Debt [Member]		Dec. 31, 2013 Prudential - Long Beach		Dec. 31, 2013 Prudential - Long Beach Secured Debt [Member]		Dec. 31, 2012 Prudential - Long Beach Secured Debt [Member]		Mar. 05, 2013 SF Bay Area - Morgan Hill	Dec. 31, 2013 SF Bay Area - Morgan Hill		Dec. 31, 2012 SF Bay Area - Morgan Hill Secured Debt [Member]		Dec. 31, 2013 SF Bay Area - Vallejo	Dec. 31, 2013 SF Bay Area - Vallejo Secured Debt [Member]	Dec. 31, 2012 SF Bay Area - Vallejo Secured Debt [Member]	Dec. 31, 2013 Ladera Ranch	Dec. 31, 2013 Ladera Ranch Secured Debt [Member]	Dec. 31, 2012 Ladera Ranch Secured Debt [Member]	Dec. 31, 2013 SF Bay Area - San Lorenzo	Dec. 31, 2012 SF Bay Area - San Lorenzo Secured Debt [Member]	Dec. 31, 2013 Las Vegas V	Dec. 31, 2013 Las Vegas V Secured Debt [Member]	Dec. 31, 2012 Las Vegas V Secured Debt [Member]	Dec. 31, 2013 Second Restated Key Bank Loan		Dec. 31, 2012 Second Restated Key Bank Loan Secured Debt [Member]		Dec. 31, 2013 Brampton - Ontario, Canada		Dec. 31, 2013 Brampton - Ontario, Canada Secured Debt [Member]		Dec. 31, 2012 Brampton - Ontario, Canada Secured Debt [Member]		Dec. 31, 2013 Bank of America Loan - 4		Dec. 31, 2013 Bank of America Loan - 4 Secured Debt [Member]		Dec. 31, 2012 Bank of America Loan - 4 Secured Debt [Member]		Dec. 31, 2013 Citi SF Bay Area Morgan Hill Loan		Dec. 31, 2013 Citi SF Bay Area Morgan Hill Loan Secured Debt [Member]		Dec. 31, 2013 KeyBank Revolver		Dec. 31, 2013 KeyBank Revolver Secured Debt [Member]		Dec. 31, 2013 John Hancock Loan		Dec. 31, 2013 John Hancock Loan Secured Debt [Member]
Debt Instrument [Line Items]
Carrying value	$ 390,371,923							$ 31,044,708	[1],[2]	$ 31,547,772	[1],[2]			$ 6,144,911	[3]	$ 6,812,855	[3]			$ 28,077,873	[4]	$ 28,466,942	[4]			$ 7,434,590	[5]	$ 7,545,688	[5]			$ 21,265,500	[6]	$ 21,587,669	[6]			$ 6,763,769	[7]	$ 6,841,134	[7]			$ 3,421,797	[8]	$ 3,474,712	[8]			$ 18,200,000	[9]	$ 18,200,000	[9]			$ 30,960,278	[10]	$ 31,000,000	[10]			$ 19,362,500	[11]	$ 19,362,500	[11]		$ 2,693,364	$ 2,768,704		$ 4,444,137	$ 4,516,470		$ 2,226,986	$ 2,263,211		$ 8,732,981	$ 8,858,838		$ 2,465,045	$ 2,502,922		$ 7,446,178	$ 7,537,926		$ 1,981,095	$ 2,018,754		$ 10,256,163	$ 10,387,192		$ 18,000,000	$ 18,000,000		$ 1,511,958	$ 1,530,923		$ 3,438,473	$ 3,480,298		$ 1,381,213	$ 1,544,325		$ 2,968,060	$ 3,036,098		$ 4,800,000	$ 4,800,000			$ 4,321,842	[12]	$ 4,400,398	[12]			$ 6,548,748	[13]	$ 6,667,782	[13]			$ 11,770,704	[14]	$ 11,984,654	[14]			$ 6,533,640	[15]	$ 6,637,926	[15]				$ 2,928,860	[16]		$ 4,295,098	$ 4,390,176		$ 6,691,304	$ 6,821,300		$ 2,099,622		$ 1,628,783	$ 1,667,485			$ 51,666,666	[17]			$ 6,482,879	[18]	$ 208,086	[18]			$ 6,394,362	[19]	$ 6,459,043	[19]			$ 3,000,000	[16]			$ 71,000,000	[20]			$ 16,682,984	[21]
Net fair value adjustment			913,837	(576,173)
Secured debt	$ 391,285,760	$ 353,440,758
Interest Rate						5.42%	[1],[2]					5.22%	[3]					5.77%	[4]					5.26%	[5]					5.47%	[6]					5.00%	[7]					4.75%	[8]					4.60%	[9]					4.65%	[10]					4.61%	[11]					6.42%			5.73%			5.65%			6.20%			5.67%			6.16%			5.67%			5.84%			6.47%			5.72%			5.93%			5.47%			5.38%			4.00%			5.18%	[12]					5.18%	[13]					5.18%	[14]					5.27%	[15]						5.75%	[16]			6.04%			5.84%			6.07%		5.02%			4.67%	[17]			5.25%	[18]					6.33%	[19]					4.08%	[16]			1.67%	[20]			6.36%	[21]
Maturity date						Sep. 05, 2019	[1],[2]					May 15, 2014	[3]					Feb. 06, 2021	[4]					Jun. 06, 2021	[5]					Jul. 01, 2021	[6]					Oct. 31, 2014	[7]					Jun. 06, 2022	[8]					Oct. 01, 2022	[9]					Nov. 01, 2022	[10]					Nov. 06, 2022	[11]					Jul. 01, 2016			Jan. 01, 2016			Mar. 01, 2016			Jun. 01, 2016			Dec. 01, 2016			Aug. 01, 2016			Feb. 01, 2017			Jan. 01, 2017			Oct. 01, 2017			Jun. 01, 2017			Jul. 01, 2017			Aug. 01, 2020			Apr. 01, 2015			May 14, 2014			Nov. 01, 2015	[12]					Nov. 01, 2015	[13]					Nov. 01, 2015	[14]					Sep. 05, 2019	[15]					Mar. 06, 2023	Apr. 01, 2013	[16]			Jun. 01, 2014			Jun. 01, 2016			Jan. 01, 2014		Jul. 01, 2015			Dec. 24, 2014	[17]			Jun. 30, 2016	[18]					Oct. 01, 2017	[19]					Mar. 06, 2023	[16]			Oct. 25, 2016	[20]			Jun. 01, 2018	[21]
Maturity of loan																																																																																																																																																				2013-10
Number of unencumbered properties					5

[1] Ten of the loans in this portfolio loan bear an interest rate of 5.43%, and the remaining loan bears an interest rate of 5.31%. The weighted average interest rate of this portfolio is 5.42%.

[2] This portfolio loan is comprised of 11 discrete mortgage loans on 11 respective properties (Manassas, Marietta, Erlanger, Pittsburgh, Weston, Fort Lee, Oakland Park, Tempe, Phoenix II, Davie and Las Vegas I). Each of the individual loans is cross-collateralized by the other ten.

[3] On January 12, 2011, we encumbered the Dufferin property with a Canadian dollar denominated loan which bears interest at the bank's floating rate plus 3.5% (subject to a reduction in certain circumstances). The rate in effect at December 31, 2013 was 5.22%.

[4] This portfolio loan encumbers 11 properties (Biloxi, Gulf Breeze I, Alpharetta, Florence II, Jersey City, West Mifflin, Chicago - 95th St., Chicago - Western Ave., Chicago - Ogden Ave., Chicago - Roosevelt Rd. and Las Vegas IV). The net book value of the encumbered properties as of December 31, 2013 was approximately $50.4 million. Such amounts are only available to satisfy the obligations of this loan.

[5] This loan encumbers the Las Vegas VII and Las Vegas VIII properties. The net book value of the encumbered properties as of December 31, 2013 was approximately $9.0 million. Such amounts are only available to satisfy the obligations of this loan.

[6] This portfolio loan is comprised of 11 discrete mortgage loans on 11 respective properties (Peachtree City, Buford, Jonesboro, Ellenwood, Marietta II, Collegeville, Skippack, Ballston Spa, Trenton, Fredericksburg and Sandston). Each of the individual loans have an original term of 30 years and mature on July 1, 2041. ING has the option to require payment of the loan in full every five years beginning on July 1, 2021.

[7] In December 2011, we entered into a Canadian dollar denominated construction loan with an aggregate potential commitment amount of approximately $9.2 million. Such loan bears interest at the bank's floating rate, plus 2% (totaling 5.00% as of December 31, 2013).

[8] The net book value of the Chantilly property as of December 31, 2013 was approximately $6.9 million. Such amounts are only available to satisfy the obligations of this loan.

[9] This portfolio loan encumbers 10 properties (Savannah I, Savannah II, Columbia, Lexington I, Stuart I, Lexington II, Stuart II, Bluffton, Wilmington Island and Myrtle Beach). The net book value of the encumbered properties as of December 31, 2013 was approximately $34.5 million. Such amounts are only available to satisfy the obligations of this loan.

[10] This portfolio loan encumbers nine properties (Los Angeles - La Cienega, Las Vegas III, Las Vegas VI, Hampton, SF Bay Area - Gilroy, Toms River, Crescent Springs, Florence and Walton). The net book value of the encumbered properties as of December 31, 2013 was approximately $42.6 million. Such amounts are only available to satisfy the obligations of this loan.

[11] This portfolio loan encumbers six properties (Mt. Pleasant I, Charleston I, Charleston II, Mt. Pleasant II, Charleston III, and Mt. Pleasant III). The net book value of the encumbered properties as of December 31, 2013 was approximately $37.2 million. Such amounts are only available to satisfy the obligations of this loan.

[12] This loan encumbers the Lawrenceville I and II properties.

[13] This loan encumbers the Concord, Hickory and Morganton properties.

[14] This loan encumbers the El Paso II, III, IV & V properties as well as the Dallas property.

[15] This loan is cross-collateralized by the 11 properties discussed in footnote (1) to this table.

[16] The SF Bay Area - Morgan Hill loan was paid off on March 5, 2013 using proceeds from the Citi SF Bay Area - Morgan Hill Loan. For additional discussion, see "Citi SF Bay Area - Morgan Hill Loan" below.

[17] Through October 28, 2013, this loan was collateralized by the Homeland Portfolio (Kennesaw, Sharpsburg, Duluth I, Duluth II, Duluth III, Marietta III, Austell, Sandy Springs, Smyrna, Lawrenceville II, Jacksonville I and Jacksonville II). This loan was a variable rate loan, such rate was based on 30-day LIBOR, which including the applicable spread equaled an interest rate of 4.67% as of October 28, 2013; however, we were required to purchase an interest rate swap with a notional amount of $45 million, and, inclusive of the interest rate swap, the effective fixed interest rate was 5.41%. For additional discussion, see "Second Restated KeyBank Loan" below. This loan was paid off in October 2013 in connection with entering into a revolving loan agreement with KeyBank National Association (the "KeyBank Revolver"). The KeyBank Revolver is further described below.

[18] In September 2012, we entered into a Canadian dollar denominated construction loan with an aggregate potential commitment amount of approximately $9.2 million. Such loan bears interest at the bank's floating rate, plus 2.25% (totaling 5.25% as of December 31, 2013).

[19] This loan encumbers the Ridgeland and Canton properties.

[20] On October 28, 2013, through our Operating Partnership and certain property-owning special purpose entities wholly-owned by our Operating Partnership, we entered into the KeyBank Revolver, which matures on October 25, 2016. Such loan encumbers the Homeland Portfolio properties, the Knoxville Portfolio properties and five other previously unencumbered properties (Gulf Breeze II, El Paso I, Toms River II, North Charleston and Phoenix I). This loan is a LIBOR based variable rate loan, and such rate is based on 30-day LIBOR, which including the applicable spread equaled an initial interest rate of 1.67% as of October 28, 2013 and remained at such interest rate as of December 31, 2013. The interest rate swap with a notional amount of $45 million that was originally entered into in connection with the Second Restated KeyBank Loan remains outstanding; inclusive of the interest rate swap, the effective fixed interest rate as of December 31, 2013 was approximately 2.4%. For additional discussion, see "KeyBank Revolver" below.

[21] This loan encumbers the Midland I, Coppell, Midland II, Arlington and Weatherford properties.