Description of the Business - Additional Information (Detail) shares in Millions	12 Months Ended
Dec. 31, 2017 Segment shares
Description Of Business And Basis Of Presentation [Line Items]
Number of reportable segments \| Segment	2
Percentage of common limited partnership interest	2.59%
Class A Common [Member]
Description Of Business And Basis Of Presentation [Line Items]
Class of common limited partnership units designated as class A common units \| shares	8.9
General Partner
Description Of Business And Basis Of Presentation [Line Items]
Percentage of ownership in operating partnership	97.41%
Preferred [Member]
Description Of Business And Basis Of Presentation [Line Items]
Percentage of ownership in operating partnership	100.00%

Description of business and basis of presentation line items.

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- Definition

Outstanding common limited partnership units converted into cash or common shares.

+ References

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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (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

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- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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