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Summary of Significant Accounting Policies - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2015
Accounting Policies [Abstract] |
Operating Partnership's minimum ownership interest in the limited partnerships | 99.00%

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- Definition The number of units or percentage investment held by one or more members or limited partners of the LLC or LP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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