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Assets for Reportable Segment (Detail) - Parent Company [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 11,417,376 | $ 11,491,919
Same Store [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 9,773,940 | 9,864,321
Non-Same Store and Other |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,439,424 | 1,427,778
Corporate assets |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 204,012 | $ 199,820

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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