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Related Party Transactions and Arrangements - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) Property | Dec. 31, 2019 USD ($) Property | Dec. 31, 2018 USD ($) Property | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Asset management fees earned |  | $ 7,726,000 | $ 6,963,000 | $ 6,006,000
Number of property acquired | Property |  | 806 | 2,379 |
Acquisition of real estate properties |  | $ 128,908,000 | $ 215,833,000 | 221,813,000
Former External Advisor | North Carolina |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Number of property acquired | Property | 328 |  |  |
Acquisition of real estate properties | $ 42,950,000 |  |  |
Former External Advisor | Management Expenses |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Asset management fees earned |  | 0 | 63,000 | 257,000
Shared Services Agreement | Former External Advisor |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Cost incurred for service provided |  | $ 0 | $ 0 | $ 727,000
Term of agreement |  | December 21, 2016 to June 20, 2017 |  |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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