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Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets and liabilities | 6 years | 7 years
Leasehold interest – land |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets and liabilities | 0 years | 6 years 10 months 24 days
In-place leases |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets and liabilities | 5 years 10 months 24 days | 6 years 3 months 18 days
Leasing costs |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets and liabilities | 6 years 10 months 24 days | 8 years 9 months 18 days
Above-market lease values and lease incentives |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets and liabilities | 0 years | 5 years 4 months 24 days
Below-market lease values and other deferred revenues |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
All intangible assets and liabilities | 1 year 1 month 6 days | 4 years 8 months 12 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://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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