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Significant Accounting Policies Update - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |
U.S. corporate tax rate |  | 35.00% |
Scenario Plan [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
U.S. corporate tax rate | 21.00% |  |
Wholly Owned Property [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Ownership interest in property |  |  | 100.00%
Commercial Real Estate [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Ownership interest in property |  |  | 0.00%

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- Definition Ownership interest in real estate property. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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