Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss	$ (7,445,198)	$ (19,015,142)	$ (21,834,237)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization expense	27,475,921	29,268,831	24,690,023
Noncash interest expense	147,472	190,724	364,438
Expense related to issuance of restricted stock	25,785	24,767	28,645
Equity in income of unconsolidated joint ventures	(805,360)	(783,452)	(710,616)
Distributions from unconsolidated joint ventures	887,673	816,720	802,086
Gain on sale of unconsolidated joint venture		(815,000)
Foreign currency exchange (gain) loss	458,662	(60,281)	16,833
Increase (decrease) in cash from changes in assets and liabilities:
Restricted cash	(1,606,887)	(1,214,746)	(1,763,420)
Other assets	(49,443)	(1,184,733)	(1,649,563)
Accounts payable and other accrued liabilities	1,071,649	2,033,098	1,464,568
Due to affiliates	(854,133)	289,554	1,430,050
Net cash provided by operating activities	19,306,141	9,550,340	2,838,807
Cash flows from investing activities:
Purchase of real estate	(62,405,547)	(85,546,702)	(198,143,849)
Additions to real estate facilities	(5,339,858)	(5,330,259)	(4,467,642)
Development and construction of real estate facilities	(8,569,106)	(7,924,666)	(4,307,108)
Deposits on acquisition of real estate facilities			1,069,201
Additional investment in unconsolidated joint ventures		(234,735)	(512,358)
Proceeds from land disposition		1,978,746
Proceeds from sale of investment in unconsolidated joint venture		1,425,000
Net cash flows used in investing activities	(76,314,511)	(95,632,616)	(206,361,756)
Cash flows from financing activities:
Proceeds from issuance of secured debt	80,934,943	82,217,152	179,290,017
Principal payments on secured debt	(3,398,567)	(3,157,375)	(1,752,724)
Repayment of secured debt	(56,695,148)	(62,833,334)	(9,939,555)
Deferred financing costs	(1,798,602)	(2,001,411)	(6,462,085)
Gross proceeds from issuance of common stock	106,280,662	113,943,394	83,856,253
Offering costs	(11,080,884)	(12,016,241)	(10,426,603)
Redemptions of common stock	(14,366,834)	(12,577,236)	(9,680,138)
Distributions paid to common stockholders	(19,275,189)	(15,831,397)	(12,311,945)
Distributions paid to noncontrolling interests	(297,167)	(251,541)	(363,078)
Escrow receivable	544,391	(182,290)	(181,750)
Due to affiliates	288,689	(98,510)	(180,558)
Restricted cash	1,550,000		(1,550,000)
Repurchase of limited partnership units in our Operating Partnership		(396,738)
Net cash flows provided by financing activities	82,686,294	86,814,473	210,297,834
Effect of exchange rate changes on cash	(72,366)	48,784	4,434
Increase in cash and cash equivalents	25,605,558	780,981	6,779,319
Cash and cash equivalents, beginning of period	13,998,391	13,217,410	6,438,091
Cash and cash equivalents, end of period	39,603,949	13,998,391	13,217,410
Supplemental disclosures and non-cash transactions:
Cash paid for interest	18,990,649	17,903,925	10,965,627
Interest capitalized	414,389	498,772	352,095
Distributions payable	3,355,882	2,724,603	2,071,876
Issuance of shares pursuant to distribution reinvestment plan	15,796,431	12,311,983	9,045,444
Assumption of notes payable issued in connection with purchase of real estate	18,025,647	6,706,790	42,580,540
Issuance of limited partnership units in our Operating Partnership in connection with the purchase of real estate facilities	1,311,772	729,218	930,759
Foreign currency translation adjustment - Real estate facilities, net	$ (2,415,103)	$ 614,721	$ (695,064)