Investment Management and Other Fees to Related Parties - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended		71 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012 Employees	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011	Jan. 31, 2009	Oct. 24, 2006
Schedule of Equity Method Investments [Line Items]
Investment Management Fee of all Real Estate Investments	0.50%			0.50%		0.50%		0.50%	0.60%
Investment management fee of of the aggregate monthly net operating income	5.00%			5.00%		5.00%		5.00%	7.00%
Percentage of acquisition fee	1.50%			1.50%		1.50%
Percentage of purchase price of real estate investments acquired for calculating maximum acquisition consulting fees	6.00%			6.00%		6.00%
Percentage of funds advanced with respect to mortgages for calculating maximum acquisition consulting fees	6.00%			6.00%		6.00%
Percentage of acquisition fee	0.75%			0.75%		0.75%
Commission fee details	(i) one-half of the competitive real estate commission or (ii) 3% of the sales price of each property sold			(i) one-half of the competitive real estate commission or (ii) 3% of the sales price of each property sold		(i) one-half of the competitive real estate commission or (ii) 3% of the sales price of each property sold
Percentage of brokerage commission	6.00%			6.00%		6.00%
Amount of obligation related to reimbursement of personnel costs expenses	$ 2,500,000			$ 2,500,000		$ 2,500,000
Total Offering costs	0	18,589,000		17,530,000	44,856,000
Offering costs incurred						237,676,000
Accrued Offering Costs Payable to Related Parties	0			0		0	1,974,000
Percentage of Investment Advisor Annual fee									0.75%
Number of employees hired from investment advisor and/or its affiliates			14
Number of days required to determine the market value of securities in the beginning	30 days			30 days		30 days
Number of days required to determine the market value of securities after the Listing	150 days			150 days		150 days
Expense associated with the Class B interest				200,000
Investment management fees earned by former investment advisor	5,159,000	5,626,000		17,270,000	15,196,000
Reduction of Management Fee	1,087,000			1,087,000
Investment Management Fee Payable to Related Party	2,045,000			2,045,000		2,045,000	1,968,000
Sub-advisory amount paid	0	777,000		1,672,000	2,098,000
Acquisition fees	944,000	803,000		2,061,000	10,179,000
Investment Advisor acquisition fees	0	150,000		209,000	1,903,000
Acquisition related expenses	0	54,000		64,000	679,000
Brokerage fees	203,000	85,000		203,000	111,000
Mortgage banking fees	0	1,362,000		0	2,113,000
Leasing fees	292,000	156,000		581,000	1,266,000
Construction management fees	246,000	5,000		803,000	24,000
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Consulting services fees percentage	2.00%			2.00%		2.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Consulting services fees percentage	5.00%			5.00%		5.00%
CBRE Global Investors [Member]
Schedule of Equity Method Investments [Line Items]
Offering costs incurred						3,969,000
Property management fees	396,000	511,000		1,168,000	1,096,000
Property management fees payable to related party	310,000			310,000		310,000	190,000
Cnl Securities Corp [Member]
Schedule of Equity Method Investments [Line Items]
Offering costs incurred	0	18,517,000		17,504,000	44,584,000	217,959,000
Investment Advisor [Member]
Schedule of Equity Method Investments [Line Items]
Offering costs incurred	0	72,000		26,000	273,000	912,000
Accrued Offering Costs Payable to Related Parties	$ 0			$ 0		$ 0	$ 1,974,000