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Stockholders' Equity - Additional Information (Detail) (USD $)
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9 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Apr. 02, 2014
Maximum [Member]
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Sep. 30, 2014
Common Stock [Member]
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Jan. 28, 2013
Common Stock [Member]
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Sep. 30, 2014
IPO [Member]
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Jan. 28, 2013
IPO [Member]
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Sep. 30, 2014
IPO [Member]
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Dec. 31, 2013
IPO [Member]
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Jan. 28, 2013
Follow-on Offering [Member]
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Sep. 30, 2014
Follow-on Offering [Member]
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Jan. 28, 2013
Follow-on Offering [Member]
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Oct. 29, 2014
Over-Allotment Option [Member]
Subsequent Event [Member]
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Oct. 24, 2014
Over-Allotment Option [Member]
Subsequent Event [Member]
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| Subsidiary, Sale of Stock [Line Items] | |||||||||||||||
| Common stock shares issued | 1,150,000 | 3,333,334 | |||||||||||||
| Public offering price | $ 15.00 | ||||||||||||||
| Gross proceeds from initial public offering | $ 56,700,000 | ||||||||||||||
| Additional common stock shares issued | 3,780,264 | 73,453 | |||||||||||||
| Net proceeds after deducting offering expenses | 51,300,000 | 13,300,000 | 857,000 | ||||||||||||
| Invested in new property acquisition | 37,900,000 | ||||||||||||||
| Expended or accrued for capital improvements | 1,700,000 | ||||||||||||||
| Distributions paid | 1,763,171 | 5,224,211 | 10,300,000 | ||||||||||||
| Uninvested proceed from initial public offering | 0 | ||||||||||||||
| Common stock, shares issued | 7,680,264 | 6,530,264 | 1,150,000 | ||||||||||||
| Price per share | $ 12.28 | ||||||||||||||
| Gross proceeds from issuance of common stock | 14,100,000 | 14,100,000 | 902,000 | ||||||||||||
| Proceeds from common stock used for repayment of existing debt | 11,100,000 | ||||||||||||||
| Uninvested proceeds from stock offerings | 0 | ||||||||||||||
| Securities allowed for issuance | $ 300,000,000 | ||||||||||||||