Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2016 USD ($) Partnership Trust	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Number of limited partnerships \| Partnership	18
Number of business income trusts \| Trust	2
Purchase of non-controlling interests	$ 187	$ 101
Proceeds from sale of property and equipment	$ 28,238	$ 1,910
Scenario, Forecast [Member]
Business Acquisition [Line Items]
Available for sale of property and equipment			$ 4,000

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569655-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4616395-111683

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Period Type:	duration