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Our Organization and Basis of Presentation - Additional Information (Detail) - shares | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Units of partnership interest (in shares) | 7,170,000 | 7,207,678 | 7,231,967

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- Definition The number of units or equivalent units outstanding for all classes. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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