Real Estate - Summary of Acquisition (Detail) - Acquisitions of Operating Properties from Third Parties [Member] ft² in Thousands, $ in Thousands	Jun. 30, 2016 USD ($) ft² Property	Jun. 30, 2015 USD ($) ft² Property
Business Acquisition [Line Items]
Number of buildings \| Property	6	10
Square feet \| ft²	889	1,444
Real estate acquisition value \| $	$ 70,045	$ 133,610

Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule III)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28.4)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant