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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Non-Controlling Interests (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Noncontrolling Interest [Abstract] |  |
OP Units | $ 25,600,000 us-gaap_MinorityInterestInOperatingPartnerships | $ 7,400,000 us-gaap_MinorityInterestInOperatingPartnerships
Consolidated joint venture interests | 1,700,000 us-gaap_MinorityInterestInJointVentures | 15,800,000 us-gaap_MinorityInterestInJointVentures
Non-controlling interests, total | $ 27,280,000 us-gaap_MinorityInterest | $ 23,218,000 us-gaap_MinorityInterest

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of the equity interests owned by noncontrolling partners in an operating partnership included in the entity's consolidated financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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