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Mortgage Notes Payable and Credit Facility - Company's Mortgage Notes Payable and Line of Credit (Detail) |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 27, 2017 | Sep. 30, 2018 USD ($) property | Sep. 18, 2018 USD ($) | Jul. 23, 2018 USD ($) | Apr. 18, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Encumbered properties | property |  | 99 |  |  |  |
Total |  | $ 542,084,000 |  |  |  | $ 542,627,000
LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on LIBOR (as percent) | 2.75% |  |  |  |  |
Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Encumbered properties | property |  | 32 |  |  |  |
Total |  | $ 30,334,000 |  |  |  | 20,715,000
Fixed rate mortgage loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Encumbered properties | property |  | 49 |  |  |  |
Carrying value |  | $ 380,620,000 |  |  |  | 383,189,000
Variable rate mortgage loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Encumbered properties | property |  | 18 |  |  |  |
Carrying value |  | $ 61,115,000 | $ 3,600,000.0 | $ 4,000,000.0 | $ 13,000,000.0 | 69,302,000
Variable rate mortgage loans | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on LIBOR (as percent) |  | 2.25% |  |  |  |
Mortgage notes payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Encumbered properties | property |  | 67 |  |  |  |
Carrying value |  | $ 441,735,000 |  |  |  |
Premiums and discounts (net) |  | (318,000) |  |  |  | (281,000)
Deferred financing costs, net |  | (4,271,000) |  |  |  | (4,830,000)
Total |  | $ 437,146,000 |  |  |  | 447,380,000
Variable rate revolving credit facility | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Encumbered properties | property |  | 32 |  |  |  |
Carrying value |  | $ 30,900,000 |  |  |  | 21,400,000
Deferred financing costs, net |  | $ (566,000) |  |  |  | (685,000)
Scheduled maturity dates |  | Oct. 27, 2021 |  |  |  |
Variable rate revolving credit facility | Revolving credit facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on LIBOR (as percent) |  | 1.75% |  |  |  |
Variable rate term loan facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Carrying value |  | $ 75,000,000 |  |  |  | 75,000,000
Scheduled maturity dates |  | Oct. 27, 2022 |  |  |  |
Variable rate term loan facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Spread on LIBOR (as percent) |  | 1.70% |  |  |  |
Total term loan, net |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Deferred financing costs, net |  | $ (396,000) |  |  |  | (468,000)
Total |  | $ 74,604,000 |  |  |  | $ 74,532,000

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