Related Party Arrangements - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Related Party Transaction [Line Items]
Notice period			120 days
Deferred Asset management fees	$ 300,000	$ 300,000	$ 900,000	$ 900,000
Deferred operating-related personnel expenses	100,000	80,000	300,000	500,000
Decrease asset management fees	(300,000)		(900,000)
Decrease operating expenses	(100,000)		(300,000)
Total deferred expenses under the terms of the Expense Support Agreement					2,800,000
Discontinued Operations
Related Party Transaction [Line Items]
Deferred Asset management fees			200,000
Deferred operating-related personnel expenses			100,000
Minimum
Related Party Transaction [Line Items]
Minimum annualized return of investment required upon ultimate liquidity of the company for restricted stock to be issued			6.00%
Restricted Stock
Related Party Transaction [Line Items]
Related party arrangement, restricted stock issuable to advisor	0.04		0.12
Related party arrangement, restricted stock issuance date			Nov. 14, 2014
Share price	$ 10		$ 10
Restricted Stock | General and Administrative Expense
Related Party Transaction [Line Items]
Cash distributions received by adviser	8,000		8,000
Restricted Stock | General and Administrative Expense | Affiliated Entity
Related Party Transaction [Line Items]
Cash distributions received by adviser	$ 15,000		$ 15,000