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Organization and Operation (Details) ft² in Millions | Dec. 31, 2018 ft² state property
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of properties owned | property | 5,797
Number of U.S. states where properties are owned (states) | state | 49
Leasable square feet | ft² | 93.3

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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