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Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-average amortization period (in years) | 9 years 7 months 6 days | 7 years 3 months 18 days
Leasehold interest – land |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-average amortization period (in years) | 0 years | 6 years 10 months 24 days
In-place leases |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-average amortization period (in years) | 9 years 7 months 6 days | 9 years 1 month 6 days
Leasing costs |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-average amortization period (in years) | 9 years 7 months 6 days | 9 years 2 months 12 days
Above-market lease values |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-average amortization period (in years) | 0 years | 2 years 1 month 6 days
Below-market lease values and deferred revenue |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-average amortization period (in years) | 0 years | 2 years 3 months 18 days

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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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- 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://www.xbrl.org/2003/role/presentationRef -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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