Investments in Real Estate - Additional Information (Detail)	12 Months Ended
Dec. 31, 2018 Investment Property	Dec. 31, 2017 Investment Property
Real Estate Properties [Line Items]
Number of real estate investments acquired \| Investment	32	27
Number of real estate properties acquired	359	115
In-place Lease Intangibles [Member]
Real Estate Properties [Line Items]
Weighted-average acquired lease intangibles	4 years	3 years
Above-market Lease Intangibles [Member]
Real Estate Properties [Line Items]
Weighted-average acquired lease intangibles	5 years	6 years
Below-market Ground Lease Intangibles [Member]
Real Estate Properties [Line Items]
Weighted-average acquired lease intangibles	65 years	53 years
Below-market Lease Intangibles [Member]
Real Estate Properties [Line Items]
Weighted-average acquired lease intangibles	7 years	6 years
Above-Market Ground Lease Intangibles [Member]
Real Estate Properties [Line Items]
Weighted-average acquired lease intangibles	86 years
Prepaid Ground Lease Rent [Member]
Real Estate Properties [Line Items]
Weighted-average acquired lease intangibles		71 years
Other Intangibles {Member]
Real Estate Properties [Line Items]
Weighted-average acquired lease intangibles		4 years
Industrial [Member]
Real Estate Properties [Line Items]
Number of real estate properties acquired	270	55
Multifamily [Member]
Real Estate Properties [Line Items]
Number of real estate properties acquired	73	48
Retail [Member]
Real Estate Properties [Line Items]
Number of real estate properties acquired	1	2
Hotel [Member]
Real Estate Properties [Line Items]
Number of real estate properties acquired	15	10

Number of real estate investments acquired during the period.

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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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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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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