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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | $ 1,332,129 | $ 1,442,411
Fair Value |  | 1,381,783 | 1,495,687
Mortgages |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 503,321 | 564,955
Fair Value |  | 531,215 | 595,964
Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 205,308 | 364,956
Fair Value |  | 228,527 | 386,253
Unsecured Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 460,000 | 460,000
Fair Value |  | 458,541 | 460,970
Unsecured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 163,500 | 52,500
Fair Value |  | $ 163,500 | $ 52,500
[1] | The carrying amounts include unamortized premiums and discounts and exclude unamortized deferred financing costs.

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- Definition Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(16)) -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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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