General - Additional Information (Detail) shares in Millions	3 Months Ended
Mar. 31, 2017 Segment shares	Dec. 31, 2016 Ground
General [Line Items]
Number of reportable segments \| Segment	2
Percentage of common limited partnership interest	2.69%
Number of ground and office space leases \| Ground		90
General Partner
General [Line Items]
Percentage of ownership in operating partnership	97.31%
Preferred [Member]
General [Line Items]
Percentage of ownership in operating partnership	100.00%
Class A Common [Member]
General [Line Items]
Class of common limited partnership units designated as class A common units \| shares	8.9

General.

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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

The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

+ References

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- Definition

Number of separate real estate development properties located on land subject to ground leases.

+ 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

No definition available.

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