Number of medical office buildings.

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Unusual or infrequent item additional insurance proceeds.

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The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

+ References

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Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Impact of Hurricane Harvey - Additional Information (Detail)	3 Months Ended	4 Months Ended	7 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Aug. 31, 2017 Building
Unusual Or Infrequent Item [Line Items]
Hurricane related insurance recoveries	$ 968,000
Hurricane insurance recoveries in excess of damaged property write-downs	4,535,000
Hurricane Harvey, Extensive Water Damage \| Houston, Texas
Unusual Or Infrequent Item [Line Items]
Number of medical office buildings \| Building					5
Hurricane Harvey
Unusual Or Infrequent Item [Line Items]
Additional insurance recovery proceeds				$ 5,500,000
Hurricane related insurance recoveries				$ 12,500,000
Hurricane insurance recoveries in excess of damaged property write-downs	$ 4,500,000
Hurricane Harvey \| Business Interruption
Unusual Or Infrequent Item [Line Items]
Hurricane related insurance recoveries			$ 968,000
Hurricane Harvey \| 2017 business interruption
Unusual Or Infrequent Item [Line Items]
Hurricane related insurance recoveries		$ 500,000