Nature of business and financial statement presentation.

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- Definition

Number of unconsolidated joint ventures.

+ References

No definition available.

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- Definition

Percentage of lease commission income upon lease execution.

+ References

No definition available.

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- Definition

Percentage of lease commission income upon tenant rent commencement.

+ References

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685

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Nature of Business and Financial Statement Presentation - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2016 $ / shares	Sep. 30, 2017 USD ($) JointVenture $ / shares	Sep. 30, 2016 $ / shares	Dec. 31, 2016 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items]
Maximum exposure to losses associated with VIEs \| $	$ 334.0		$ 334.0		$ 405.4
Common share dividends declared per share \| $ / shares	$ 0.19	$ 0.19	$ 0.57	$ 0.57
Percentage of lease commission income upon lease execution			50.00%
Percentage of lease commission income upon tenant rent commencement			50.00%
Variable Interest Entity, Not Primary Beneficiary [Member]
Nature Of Business And Financial Statement Presentation [Line Items]
Number of unconsolidated joint ventures \| JointVenture			2