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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Significant Accounting Policies [Line Items]

Federal Deposit Insurance Corporation deposit insurance limit per institution

$ 250,000

Restricted cash

5,413,000

$ 5,206,000

Amortization expense for intangible assets

7,206,000

3,778,000

$ 490,000

Amortization expense for intangible assets expected for 2016

3,735,000

Depreciation expense

20,888,000

8,742,000

3,923,000

Advertising expenses

1,399,000

675,000

336,000

Mortgage indebtedness, carrying amount

584,337,000

400,509,000

Mortgage indebtedness, outstanding principal

975,531,000

417,369,000

Cash and cash equivalents

38,301,000

14,763,000

3,334,000

$ 2,533,000

Income tax expense

$ 0

$ 0

$ 0

Taxable income distributable to stockholders

90.00%

Dividends characterized as capital gain distribution

17.00%

Dividends characterized as return of capital

83.00%

65.00%

Dividends characterized as ordinary taxable income

35.00%

Accumulated other comprehensive income

$ (8,000)

Deferred costs

9,226,000

$ 2,924,000

Deferred costs, accumulated amortization

1,726,000

505,000

Cash Flow Hedge | Interest Rate Cap

Significant Accounting Policies [Line Items]

Derivative, notional amount

$ 200,000,000

Derivative, maturity date

Oct. 17, 2017

Derivative, fair value

$ 24,000

Accumulated other comprehensive income

(8,000)

Reclassified out of accumulated other comprehensive income to earnings, amount

$ 0

Cash Flow Hedge | 1-month LIBOR

Significant Accounting Policies [Line Items]

Interest rate cap strike rate

3.00%

Scenario Forecast | Cash Flow Hedge | Interest Rate Cap

Significant Accounting Policies [Line Items]

Reclassified out of accumulated other comprehensive income to earnings, amount

$ 2,000

Mortgages

Significant Accounting Policies [Line Items]

Indebtedness fair value

$ 589,320,000

411,311,000

Bridge Term Loan

Significant Accounting Policies [Line Items]

Mortgage indebtedness, outstanding principal

^[1]

120,000,000

Secured Credit Facility

Significant Accounting Policies [Line Items]

Mortgage indebtedness, outstanding principal

271,500,000

^[2]

$ 18,392,000

^[3]

Natural Disasters and Other Insurable Events

Significant Accounting Policies [Line Items]

Rent revenue recognized

$ 322,000

Alabama

Significant Accounting Policies [Line Items]

Percentage of rental revenue

0.48%

Florida

Significant Accounting Policies [Line Items]

Percentage of rental revenue

1.21%

Georgia

Significant Accounting Policies [Line Items]

Percentage of rental revenue

6.66%

North Carolina

Significant Accounting Policies [Line Items]

Percentage of rental revenue

7.02%

South Carolina

Significant Accounting Policies [Line Items]

Percentage of rental revenue

3.47%

Tennessee

Significant Accounting Policies [Line Items]

Percentage of rental revenue

10.24%

Texas

Significant Accounting Policies [Line Items]

Percentage of rental revenue

9.43%

Building and Building Improvements

Significant Accounting Policies [Line Items]

Depreciable Lives

40 years

Leases Acquired In Place

Significant Accounting Policies [Line Items]

Acquisition of above-market in-place leases

$ 7,690,000

Maximum

Significant Accounting Policies [Line Items]

Cash and cash equivalents maturity period

3 months

Maximum | Equipment and Fixtures

Significant Accounting Policies [Line Items]

Depreciable Lives

10 years

Minimum | Equipment and Fixtures

Significant Accounting Policies [Line Items]

Depreciable Lives

5 years

[1]	The bridge term loan may be extended by 6 months at our option. If extended, the maturity date would be March 2017
[2]	The total capacity of the secured credit facility is $325.0 million, of which $271.5 million was outstanding as of December 31, 2015.
[3]	The secured credit facility total capacity was $30.0 million, of which $18.4 million was outstanding as of December 31, 2014

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