Number of buildings acquired.

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Net rentable area for properties owned.

+ References

No definition available.

+ Details

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- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

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- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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Subsequent Events (Detail) $ / shares in Units, $ in Thousands				3 Months Ended	9 Months Ended		12 Months Ended
	Nov. 02, 2017 USD ($)	Oct. 31, 2017 USD ($) ft² building	Oct. 30, 2017 USD ($) $ / shares	Sep. 30, 2017 ft²	Sep. 30, 2017 USD ($) ft² building	Sep. 30, 2016 USD ($)	Dec. 31, 2016
Subsequent Event [Line Items]
Number of buildings \| building					39
Rentable square feet \| ft²				3,582,375	3,582,375
Payments to acquire real estate					$ 532,108	$ 308,277
Dividend percentage				5.875%			5.875%
Series A Preferred Stock
Subsequent Event [Line Items]
Dividend percentage				5.875%
Subsequent Event \| Operating Partnership Units
Subsequent Event [Line Items]
Cass dividend (in dollars per share) \| $ / shares			$ 0.145
Subsequent Event \| Series A Preferred Stock
Subsequent Event [Line Items]
Cass dividend (in dollars per share) \| $ / shares			0.36719
Subsequent Event \| Common Stock
Subsequent Event [Line Items]
Cass dividend (in dollars per share) \| $ / shares			$ 0.145
Subsequent Event \| 12345 First American Way
Subsequent Event [Line Items]
Proceeds from Sale of Real Estate			$ 7,600
Subsequent Event \| 9401 De Soto
Subsequent Event [Line Items]
Proceeds from Sale of Real Estate	$ 23,000
13225 S Western Avenue and 15401 S Figueroa St
Subsequent Event [Line Items]
Number of buildings \| building					4
Rentable square feet \| ft²				218,407	218,407
13225 S Western Avenue and 15401 S Figueroa St \| Subsequent Event
Subsequent Event [Line Items]
Number of buildings \| building		2
Rentable square feet \| ft²		59,594
Payments to acquire real estate		$ 6,700